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7 - Pizza Dough and Pizza Crust Troubleshooting


This chapter describes 50 problems that can occur with pizza dough and pizza crust (see "Contents" list below). For each problem there's a description of possible causes and remedies, with the most likely causes listed first.

To go directly to a particular problem description, click on the number of the item that describes the problem you have. Then find the best remedy for solving the problem. To return to the Contents menu, use your Back button.

To do a keyword search, click search.

CONTENTS
How to Use This Trouble-shooter - Additional Help

1. Dough too stiff or too firm
2. Dough too slack or too soft
3. Dough balls not rising at all (unrisen or dead dough)
4. Under-risen dough balls, or dough balls rising too slowly
5. Over-risen dough balls, or dough balls rising too quickly
6. Dough balls joining together in the dough tray
7. Dough has an odor of beer
8. Dough balls collapsing (blown dough)
9. Dough (crust) not rising in the oven, even though the dough balls were proofed
10. Crust forming on dough balls

11. Panned dough collapsing when sauced
12. Dough too elastic or springy (shrinks excessively after stretching)
13. Dough too extensible or spreadable (thin spots occurring during screening)
14. Dough sticking to rolling pin, table, or hands
15. Dough tearing in a dough press
16. Dough too large after rolling or stretching (won't fit pan or screen)
17. Excessive flour sticking to rolled dough
18. Black spots on top of dough ball
19. Bluish-black spots on underside of dough ball
20. Crust not brown enough all over

21. Crust too brown all over
22. Crust not brown enough on bottom
23. Crust too brown on bottom
24. Crust not browning and has a tough texture
25. Top edge of outer crust has a whitish color (but rest of pizza is done)
26. Crust browns on one side only or browns unevenly
27. Crust edge is burnt (but rest of pizza is properly done)
28. Crust color uneven
29. Large white pockets on bottom of pan pizza crust
30. Crust fully baked but still has a white surface

31. Crust forms bubbles during baking
• Discussion: Crust Bubbling
32. Crust grain is too close (small cells)
33. Crust grain is too open (large cells)
34. Streakiness or uneven grain in crust
35. Crust edge has large burnt spots
36. Crust bakes up flat (no oven spring)
37. Crust collapses (shrinks in height) immediately after pizza is taken from the oven
38. Crust tough and leathery (especially after it cools down)
39. Crust flat and crackery
40. Crust flat, dense, and tough

41. Crust lacks flavor
42. Crust has peculiar flavor
43. Crust has doughy layer under the sauce (crust done on outside but raw inside)
• Discussion: Doughy Layer vs. Gummy Layer
44. Crust has gummy layer under the sauce
45. Soggy crumb with grayish tint or translucent, gummy appearance
46. Crust is uneven thickness (thick edge, thin middle)
47. Crust is soggy or floppy (slice flops over when picked up)
48. When parbaking, crust separates like pita or pocket bread
49. Crust made from retarded dough has small blisters
50. Crust sticks to pan or screen
• How to Season pans

NOTE: Visit the Encyclopizza home page for the complete Table of Contents, including pizza dough/crust/sauce recipes.




IN most pizzerias, dough and crust problems exceed all other product problems combined. Prior chapters on Dough Ingredients, Dough-making, and Dough Management provide proce­dures for avoiding these problems. However an occasional problem might still occur and if it does this chapter can serve as a trouble-shooting reference guide.

How to Use This Trouble-shooter

Each problem is listed as a heading. Under each heading is a description of possible causes and remedies for the prob­lem. The most likely causes are listed first. In addition some sections con­tain a discussion to aid understand­ing.

Although this chapter explains what to do, for a complete under­standing of how and why something works you should refer to prior chapters on Dough Ingredients, Dough-making, and Dough Manage­ment. Using recom­mended procedures will go a long way to helping you avoid problems in the first place.

Additional Help

This chapter covers about 99 percent of the dough/crust prob­lems occurring in pizzerias. However, if you have a problem not listed here, you might try:

•   A baking reference book such as The Bakeshop Trouble Shooter by A. J. Vander Voort.

•   Your flour or yeast company’s technical repre­sen­­ta­tive or field consultant.  Check the product package for a phone number.

•   The American Institute of Baking, 1213 Bakers Way, Manhattan, KS, 66502. (913) 537-4750 or 800-633-5137.

 


1 - Dough too stiff or too firm

(Also see a subsequent section on Dough Too Elastic or Springy)

Possible Causes

Remedy                                                         

Too little water or too much flour

For subsequent batches, check reci­pe amounts and weigh ing­redients care­fully. If the problem is detected during mixing, add slightly more water and mix until just absorbed. (See Comment below.)

Dough (balls) too cold

Warm dough (balls) to 50 to 60 degrees F before using.

Dough unrelaxed

If feasible, flatten the dough balls 2 to 3 minutes before stretching or screening.

Inadequate fermentation

Increase fermentation or rise. See subsequent section on Under-risen Dough Balls.

Dough under-mixed

Mix (knead) slightly longer. Read the Mixing section in the Dough-making chapter.

COMMENT: This problem is hard to correct for the current batch unless it’s discov­ered in the early stages of mixing. It’s also more difficult to remedy with a cutter-mixer than with a planetary mixer because a cutter-mixer is hard to re-start with dough in it. If the problem can’t be corrected by adding water, re-mix small pieces of the stiff dough into batches of new dough. Don’t exceed 25 percent re-mixed dough per batch. Add it on top of the flour. Increase the water portion of the new batches enough to compensate for the under-portion of water in the stiff dough. If that’s too difficult to do, discard the stiff dough.

 

2 - Dough too slack or too soft

(Also see a subsequent section on Dough Too Extensible or Spreadable)

Possible Causes

Remedy    

Too much water or too little flour

For subse­quent batches, check reci­pe amounts and weigh ingredients care­fully. If the problem is detected immediately after mixing, add slightly more flour and keep mixing. If this can’t be done, re-mix small pieces of the slack dough into batches of new dough. Try to add only 10 percent slack dough per batch, but up to 25 percent can work. Add it during the last minute of mixing. Decrease the water portion of the new batch enough to compen­sate for the over-portion of water in the slack dough.    

Dough (balls) too warm

Refrigerate dough (balls) down to 40 degrees F before using.

Excessive fermentation

Reduce fermentation or rise. See section on Over-risen Dough Balls.

Dough over-mixed

If not severely over-mixed, mix small pieces into new dough (as described above). If dough is severely over-mixed, discard it. For subsequent batches, use a timer when mixing. Read the Mixing section in the Dough-making chapter.

 

3 - Dough balls not rising at all (unrisen or dead dough)

 

Possible Causes

 

Remedy        

No yeast

Include yeast in subsequent batches.

Old (dead) yeast

Discard old (dead) yeast and use new yeast. Store yeast properly. (Read di­rections on package or read about proper storage methods in the Yeast section of the Dough Ingredients chapter).

Yeast water too hot, so yeast died

Keep yeast water temperature under 115 degrees F. (Read directions on package or read the Yeast section of the Dough Ingredients chapter.)

 

4 - Under-risen dough balls, or dough balls rising too slowly

 

Possible Causes

 

Remedy

Partially dead (old) yeast

Discard old yeast and use new yeast. Store yeast properly. (Read directions on package or read about proper storage methods in the Yeast section of the Dough Ingredients chapter.)

Yeast improperly rehydrated

Rehydrate yeast in water of proper temperature. (Read directions on package or read about proper hydration methods in the Yeast section of the Dough Ingredients chapter.)

Not enough yeast

Increase yeast portion. For subse­quent batches, check reci­pe amounts and weigh ing­redients carefully.

Dough too cold coming from mixer

Increase dough water temperature so dough comes from mixer at higher temperature. Read the Mixing section of the Dough-making chapter. 

Dough stored at too low of a temperature

Raise the temperature of the refrig­erator (retarder) a few degrees but not over 40 degrees F. Or, if that’s not possible, let the dough balls sit at room temperature or put them into a proofer before using. For more specifics, read the chapter on Dough Management.

Yeast rehydration water too cold

Raise the rehydration water temperature to that specified by the manufacturer (see instructions on the yeast carton).

Inadequate fermentation time

Make dough farther ahead of usage; allow more time for fermentation or rising.

COMMENT: In addition to the causes cited above, amount of rise can be affected by salt, sugar, acidity, water, and yeast nutri­ents in the dough, and also by the composition of the flour. For a complete discussion, read the Yeast section of the Dough Ingredients chapter.

 

5 - Over-risen dough balls, or dough balls rising too quickly

 

Possible Causes

 

Remedy

Too much yeast

Reduce yeast portion. For subsequent batches, check reci­pe amounts and weigh ing­redients carefully.

Dough too warm coming from mixer

Decrease dough water temperature so dough comes from mixer at lower temperature. Read the Mixing section of the Dough-making chapter..

Dough stored at too high of a temperature

Criss-cross trays of dough for 60 to 90 minutes when first put into refrig­erator. Don’t let dough sit (as long) at room temperature. Keep refrigera­tor temperature low. For more specifics, read the Dough Management chapter.

Dough mixed too far ahead; too much fermentation time

Mix dough closer to when it will be used. Project sales and correlate dough ball production to projected usage.

COMMENT: In addition to the causes cited above, amount of rise can be affected by salt, sugar, acidity, water, and yeast nutri­ents in the dough, and also by the characteristics of the flour. For a complete discussion, read the Yeast section of the Dough Ingredients chapter.

 

6 - Dough balls joining together in the dough tray

 

Possible Causes

 

Remedy 

Over-risen dough

Reduce amount of rise in the dough. See previous section on Over-risen Dough Balls.

Poor dough ball placement         

When placing dough balls in the tray, position them so balls are the same distance apart—or 1-1/2 to 2 inches.

Too many balls in tray

Reduce number of dough balls per tray.

 

7 - Dough has an odor of beer

 

Possible Causes

 

Remedy

Severely over-fermented dough

Reduce amount of fermentat­ion. See previous section on Over-risen Dough Balls.

COMMENT: Discard dough that smells like beer as it’s severely over-fermented. Do not re-ball or re-mix it.

 

8 - Dough balls collapsing (blown dough)

 

Possible Causes

 

Remedy 

Severely over-risen dough (too much fermentation)

Reduce the amount of rise or fermen­tation. See previous section on Over-risen Dough Balls. In addition, many random factors can cause over-risen dough—things like a power outage, A/C outage, cooler malfunction, and leaving the cooler door open too long.

Flour too weak

Use a stronger flour—one with higher quality or quantity of protein.

COMMENT: There’s two attitudes toward using blown dough. Some say it should never be used but, instead, should be dis­carded. Other experts recommend re-using it if it’s new dough (i.e., less than 24 hours old). They suggest re-balling it if it can be used within 12 hours. If it’s between 24 to 48 hours old, they suggest mixing it in with a new batch. Try to add only 10 percent blown dough per batch, but some say up to 50 percent can be mixed with new dough. Add it during the last minute of mixing. If it’s over 48 hours old it should probably be discarded. If it smells like beer it should defi­nitely be discarded.

 

9 - Dough (crust) not rising in the oven, even though the dough balls were proofed

 

Possible Causes

 

Remedy

Severely over-risen dough (too much fermentation)

Reduce amount of rise or fermentation. See previous section on Over-risen Dough Balls.

 

10 - Crust forming on dough balls

 

Possible Causes

 

Remedy  

Dough balls exposed too long to open air

(1) Cover dough balls with a tray, cover, plastic wrap, or plastic bag.
(2) Shorten the time that trays of dough are criss-crossed in the refrig­erator (max. 60 to 90 minutes). (3) Keep balls covered when warming up.
(4) Brush dough balls with oil (how­ever, if dough is kept tightly covered with a tray or pan, oil brush­ing isn’t needed).

Floured too far ahead

Flour dough balls no more than 2 to 3 minutes before rolling or stretching.

COMMENT: Slight drying or crusting of a dough ball doesn’t harm crust quality. However, a dough ball with heavy crusting—the kind that makes a “turtle shell” crust—should be discarded. Do not try to hide thick crusting by rolling it into the center of the dough ball.

 

11 - Panned dough collapsing when sauced

 

Possible Causes

 

Remedy

Excessive rise or fermentation

Reduce the amount of rise. See prev­ious section on Over-risen Dough Balls.

Too much pressure from sauce spoon

Reduce the amount of downward pressure when applying the sauce.

 

12 - Dough too elastic or springy (shrinks excessively after stretching)

(Also see a previous section on Dough Too Stiff )

Possible Causes

Remedy

Flour’s protein level is too high

(1) Switch to a flour of 1 to 2 percent lower protein content, or (2) blend a lower protein flour with the current flour.  

Dough under-mixed

Mix dough longer (try 10 to 20 percent more time).

Dough unrelaxed

(1) Let dough relax for 30 minutes after mixing. (2) If feasible, flatten dough balls 2 to 3 minutes before final rolling or pressing.

Too cold

Warm the dough (balls) to 60 to 70 degrees F before using.

Protein too strong

If reducing the flour protein content is undesirable, (1) increase the oil or shortening level up to 4 to 5 percent of flour weight, or (2) use a dough relax­er—i.e., reducing agent—such as L-cysteine (see Comment below).

Inadequate fermentation

Increase fermentation or rise. See previous section on Under-risen Dough Balls.

Too stiff

Increase amount of water in dough formu­la. See previous section on Dough Too Stiff.

COMMENT: There are several types of dough relaxers, each one affecting dough a different way and at a different time. Check with the manufacturer(s) to find out which type is best suited for your production system.

 

13 - Dough too extensible or spreadable (thin spots occurring during screening)

(Also see a previous section on Dough Too Slack)

Possible Causes

Remedy

Flour’s protein level is too low

(1) Switch to a flour of 1 to 2 percent higher protein content, or (2) add vital wheat gluten to current flour.  

Dough over-mixed

Mix dough less (try 10 to 20 percent shorter time).

Protein too weak

(1) Switch to a stronger (i.e., higher quality) flour, or (2) decrease the oil or shortening level, or (3) if it’s being used, eliminate or reduce the dough relaxer.

Dough too warm

Use dough of a colder temperature. Leave dough in the cooler until just before using.

Dough too slack

Decrease amount of water in formu­la. See previous section on Dough Too Slack.

 

14 - Dough sticking to rolling pin, table, or hands

 

Possible Causes 

 

Remedy 

Inadequate amount of dusting flour or cornmeal used

(1) Sprinkle more flour or cornmeal onto the table and/or (2) dip the dough ball (both sides) into flour or cornmeal before rolling.

Wrong flour used for dusting       

Use bread flour—not cake, pastry or all-purpose flour—for dusting the table. Finely ground semolina or corn meal works well, too (and eliminates flour dust settling around the store).

Too much pressure used on first roll

When using a rolling pin, too much downward pressure on the first roll can cause dough to stick to the table or pin. To eliminate the problem, apply less pressure on the first roll and increasingly greater pressure on subsequent rolls.

Too much diastatic action in the dough

If diastatic malt is used in the dough formula, eliminate or reduce the amount, or switch to non-diastatic malt. (Read about malt products in the Dough Additive section of the Dough Ingredients chapter. There are var­ious types of malt. Consult with a manu­facturer for details on what is best suited for your production requirements.)

Dough too slack

Use stiffer dough. See previous section on Dough Too Slack.

COMMENT: Although not commonly done, some pizzerias use oil instead of flour when rolling dough. They apply a thin coating of oil to the table and/or dough ball before rolling or stretching.   

 

15 - Dough tearing in a dough press

See previous section on Dough Too Elastic or Springy.


 

 

16 - Dough too large after rolling or stretching (won’t fit pan or screen)


REMEDY: If this problem occurs frequently, use stiffer dough. For ways to make stiffer dough, see the previous sections on Dough Too Slack and Dough Too Extensible. If it only happens occasionally due to slight over-rolling or over-stretching, jiggle the dough (in the pan or on the screen) until it shrinks to the proper size. Avoid the habit of trimming off dough to make over-stretched dough fit the pan or screen.

 

 

17 - Excessive flour sticking to rolled dough

 

Possible Causes

 

Remedy   

Wrong flour used for dusting       

Use bread flour—not cake, pastry or all-purpose flour—for dusting the table and dough. Or switch to finely ground cornmeal or finely ground semolina.

Improper flouring and stretching methods: (a) Dough balls floured too far ahead and/or (b) Rolled dough stacked together before panning and/or (c) Inadequate slapping to remove flour.

Flour dough balls no more than 2 to 3 minutes ahead; don’t stack up rolled dough too far ahead; slap or brush excess flour off of dough.

Too much diastatic action in the dough

If diastatic malt is used in the dough formula, eliminate or reduce the amount, or switch to non-diastatic malt. (Read about malt products in the Dough Additive section of the Dough Ingredients chapter. There are var­ious types of malt. Consult with a manu­facturer for details on what is best suited for your production requirements.)

Dough too slack

Use stiffer dough. See previous section on Dough Too Slack.

COMMENT: Although not commonly done, some pizzerias use oil instead of flour when rolling dough. They apply a thin coating of oil to the table and/or dough ball before rolling or stretching.   

 

18 - Black spots on top of dough ball

 

Possible Causes

 

Remedy 

Oxidation of bran particles in old dough

In future batches, lower dough pH by adding an acidic ingredient to the formula, such as 2 to 4 oz of vinegar per 25 lb flour. NOTE: Increasing the acidity of dough can inhibit crust browning, so it may be necessary to add non-fat dry milk or whey to increase browning. Increased acidity also inhibits fermentation, so it may be necessary to increase yeast level or dough temperature.

COMMENT: Although the spots look unsightly on a dough ball, in fact, they’re harmless and disappear during baking. So they might best be ignored.

 

19 - Bluish-black spots on underside of dough ball

 

Possible Causes 

 

Remedy  

Undispersed yeast colonies in the dough

Rehydrate (dissolve) yeast completely before adding to the dough. Might also try a longer mixing time if using a planetary mixer.

COMMENT: Some experts suggest that these spots are caused by yeast colonies that don’t completely disperse during mixing. Apparently the colonies die and release ammonia that discolors the dough.

 

20 - Crust not brown enough all over

(Cheese and toppings bake to full doneness before crust turns brown)

 

Possible Causes

 

Remedy   

Inadequate amount of sugar in dough

Add lactose—i.e., whey or non-fat dry milk—to dough formula. Use 3 to 6 percent of flour weight. Sucrose, or table sugar, can also be used but it increases fermentation, which can produce undesirable side effects—so whey or non-fat dry milk is preferred.

Too much flour left on surface of dough

(1) Slap off all flour before laying dough onto pan, screen, or peel. (2) Keep pizza screens out of flour—i.e., don’t lay them on a flour-covered table.

Excessive fermentation

Reduce fermentation. See previous section on Over-risen Dough Balls.

Oven temperature too low

Raise baking temperature and, poss­ibly, reduce baking time.

 

21 - Crust too brown all over

(Crust turns brown before the cheese and toppings are fully baked)

 

Possible Causes

 

Remedy          

Too much sugar in dough

Reduce the amount of whey, non-fat-dry milk, and/or sugar in dough for­mula.

Dough may be very young

Allow longer fermentation time prior to using.

 

22 - Crust not brown enough on bottom

(Top of pizza bakes to full doneness before bottom of crust turns brown)

Possible Causes

Remedy   

Inadequate bottom heat in oven (or too much top heat)

Adjust oven baffles, air fingers, and/or temperature controls so there’s more bottom heat relative to top heat.

Improper rotation of pizzas in a deck oven (i.e., always putting pizzas onto the same spot of the deck)

When baking with a deck oven, rotate pizzas through various spots on the deck, thereby allowing each spot maximum time to regain lost heat. If this doesn’t solve the problem, it may be time to purchase additional ovens.

Pizzas too close together in an electric infrared conveyor oven

Allow at least a 2-inch space between pizzas on the conveyor belt of an elec­tric infrared oven.

Using infrared-reflective aluminum pans in an infrared type oven (ex., CTX-type conveyor oven)

(1) Have aluminum pans anodized. This increases their infrared heat absorption cap­acity. (2) Or use black steel pans instead of aluminum. NOTE: Contrary to popular belief, holes in a pan do not signif­icantly reduce baking time or increase heat conductivity.

Too much flour left on bottom of dough

(1) Slap off all flour before laying dough onto pan, screen, or peel. If using flour on the peel, switch to finely ground cornmeal or semolina. (2) Keep pizza screens out of flour—i.e., don’t lay them on a flour-covered table.

 

23 - Crust too brown on bottom

(Bottom of crust turns brown before top of pizza is fully baked)

Possible Causes

Remedy   

Inadequate top heat in oven (or too much bottom heat)

If using a deck oven, open the baffle to allow more top heat. If using a convection or impingement-type conveyor oven, refer to the oven manual and confirm that the finger arrangement is correct. If necessary, adjust oven baffles, air fingers, and/or temperature controls so that there’s more top heat relative to bottom heat.

Sloppy oven-tending methods (i.e., leaving deck oven doors open too much)

Keep oven door closed as much as possible—don’t open the door and walk away from oven (i.e., never take your hand off the oven door while the door is open).

 

24 - Crust not browning and has a tough texture

 

Possible Cause   

 

Remedy 

Excessive fermentation

Reduce fermentation. See previous section on Over-risen Dough Balls.

Oven temperature too low

Raise baking temperature and, perhaps, reduce baking time.

 

25 - Top edge of outer crust has a whitish color (but rest of pizza is done)

 

Possible Cause   

 

Remedy 

Too much flour left on surface of dough

(1) Slap off all flour before laying dough onto pan, screen, or peel, and/or (2) brush outer edge of dough with oil prior to baking.

 

26 - Crust browns on one side only or browns unevenly

 

Possible Causes 

 

Remedy            

Placing pizza too close to side or back wall of a deck oven

(1) Keep pizzas at least 2 inches from side or back wall of baking chamber. (2) Rotate pizzas 180 degrees half way through baking.

Non-uniform heat in baking chamber (deck oven or convection conveyor oven)

Adjust oven baffles, air fingers, and/or temperature controls so that heat is uniformly dispersed in baking chamber.

 

27 - Crust edge is burnt (but rest of pizza is properly done)

 

Possible Causes

 

Remedy        

Outer edge rolled too thin

Make the outer edge thicker by: (1) Rolling dough to 3/4 final diameter, then hand-stretching it to final size; or (2) when rolling dough don’t roll off the edge with the rolling pin (roll just up to the edge but not over it).

Outer edge too high in the pan

Don’t extend the edge of the dough so high up the side of the pan.

 

28 - Crust color uneven

 

Possible Causes

 

Remedy            

Uneven oven heat

FOR DECK OVENS AND INFRARED CONVEYOR OVENS: Keep pizzas at least 2 inches from the side walls. See previ­ous section on Crust Over-browns on One Side. FOR CONVECTION (i.e., IMPINGE­MENT-TYPE) CONVEYOR OVENS: Clean the impinger fingers; make sure fingers and baffles are properly installed and fan is working properly.

Excess flour

(1) Remove excess flour from dough before assembling the pizza, and/or (2) brush outer edge of crust with oil before baking.

Re-working dough scraps into new dough during sheeting

Older dough browns less than new dough, so when pieces of old and new dough are rolled together they create a crust of uneven browning.

 

29 - Large white pockets on bottom of pan pizza crust

 

Possible Causes

 

Remedy   

Air and steam build-up between dough and pan bottom       

(1) When placing dough into pan, press out all air pockets between the dough and pan. (2) Use a pan with holes so air and steam build-up can escape during baking, thereby allow­ing the entire crust to come into contact with the pan bottom. NOTE: If a large amount of oil is used, holes cannot be used.

 

30 - Crust fully baked but still has a white surface

See the previous section on Crust Not Brown Enough All Over.

 


 

31 - Crust forms bubbles during baking

 

Possible Causes

 

Remedy   

Dough under-proofed (i.e., under-risen)         

Use more-risen dough for making pizza. See the previous section on Under-risen Dough Balls. Also, read the chapter on Dough Manage­ment.

Dough over-proofed
(i.e., over-risen)

Use less-risen dough for making pizza. See the previous section on Over-risen Dough Balls. Also, read the chapter on Dough Management.

High percentage of water in dough formula

Reduce the water portion in the dough formula by 2 to 4 percent of flour weight. This can help reduce the presence of super-large (pita-bread style) bubbles.

COMMENT: Most bubbling problems are caused by under-proofed dough. For top quality crust, the recommended way to reduce bubbling is use optimally proofed dough—neither under-risen nor over-risen. However sometimes that’s not always possible. In emer­gency cases, when dough is under-proofed, perforate the rolled dough using a dough docker. However, docking has the effect of creating a very flat crust. So unless you desire a flat crust, docking should only be used as a last resort. Other methods of (possibly) reducing bubbles include (a) assem­bling the pizza with the soft bottom side of the dough facing up, and (b) using a slightly longer bake time and lower tempera­ture. Because crust bubbling is a universal concern among pizze­rias, the following special discussion is provided.

Discussion: Crust Bubbling

Dough/crust bubbling is a problem that has plagued pizzerias for decades. Of course, not all pizzerias consi­der it a problem. Some actually like bubbles because they feel their customers like them. However, many operators abhor bubbles, especially the large kind that move cheese and toppings off an entire slice or, worse yet, off half the pizza. 

To eliminate bubbles it helps to know what happens during baking. Here’s how it works. Dough contains thousand of air cells created during fermentation or proofing. These air cells are separated from one another by cell walls. At the onset of baking, the air cells expand slightly due to a burst of yeast activity, a process called oven spring. Following oven spring, the starch in the cell walls gelatinizes, or absorbs surrounding moisture. Gelatinization, in turn, causes the protein (i.e., gluten) in the cell walls to lose moisture. The reduction of moisture in the protein causes it to retract and become less elastic. This results in pinpoint holes forming in the cell walls. Following that, the protein coagulates and, thereby, firms up—giving the crust its firm cellular structure. Following coagu­la­tion, steam develops in the cells and vents out the pinpoint holes and, eventually, out the top of the crust. To see evidence of where steam vents out the top of the crust, scrape away the cheese and sauce from a properly proofed, properly baked pizza and you’ll see many small holes in the top of the crust, which served as steam vents.

For the pinpoint holes to form in the cell walls, the walls must be of the proper thickness and contain the proper amount of moisture. When dough is improperly proofed—that is, either under-risen or over-risen—the cell walls are of the “wrong” thickness. In under-proofed dough they are too thick. In over-proofed dough they are too thin.

When holes fail to form in the cell walls, the steam generated during baking cannot dissipate properly from the cells. As a result, it builds up within each cell, forcing the cell upward and eventually ripping the cell walls. In effect, instead of dissipating through an open cellular network and out the top of the crust, as happens with properly proofed dough, the steam rips open the cellular structure in a chain reaction—rupturing one cell wall after another and, eventually, forming one large cell.

There’s a difference between bubbles formed from under-proofing versus over-proofing. Bubbles from under-proofing tend to be flat but large in diameter. If unpopped, they can blow up an entire pizza. This is the process by which pita or pocket bread is made. Bubbles from over-proofing tend to be high but smaller in diameter. They rise up like little ping-pong balls and eventually form a hole at the top, at which time they stop expanding. They almost always burn. Most pizza bubbling problems are of the under-proofed type. 

To resolve a bubbling problem, dough fermentation must be adjusted accordingly. To stop bubbling caused by under-proofed dough, increase the amount of fermenta­tion. To stop bubbling caused by over-proofed dough, reduce the amount of fermentation.

In addition to proper proofing, it has been found that reducing the amount of water in a dough formula can help with reducing bubbling when dealing with the under-proofed type. The reduction in moisture aids in creating the pinpoint holes in the cells walls. 

 


32 - Crust grain is too close (small cells)

 

Possible Causes

 

Remedy   

Under-risen dough
(i.e., under-proofed)      

Increase fermentation or rise. See previous section on Under-risen Dough Balls.

 

33 - Crust grain is too open (large cells)

 

Possible Causes

 

Remedy   

Over-risen dough
(i.e., over-proofed)         

Reduce fermentation or rise. See previous section on Over-risen Dough Balls.

Dough inadequately molded or compres­sed after mixing

Flatten dough (balls) with a dough-roller or press, thereby dividing the large air cells produced during mix­ing into smaller cells.

 

34 - Streakiness or uneven grain in crust

 

Possible Causes

 

Remedy   

Re-working too much old scrap 

When sheeting dough or pizza shells, use no more than 25 percent scrap. Re-work scrap only once. Let rolled dough or pizza shell achieve full fermentation before baking.

 

35 - Crust edge has large burnt spots

 

Possible Causes

 

Remedy   

Large air cells in dough  

Before stretching the dough, press the edge to flatten large air cells. Also, see previous section on Crust Grain is Too Open.

Dough over-risen

Use less-risen dough for making pizza. See the previous section on Over-risen Dough Balls.

 

36 - Crust bakes up flat (no oven spring)

 

Possible Causes

 

Remedy   

Under-risen dough (i.e., under-proofed)     

Increase the dough rise. See previous section on Under-risen Dough Balls. In short, allow dough balls to rise (i.e., proof) more before rolling or stretching, and/or allow rolled or pressed dough to rise in the pan or screen before baking. If possible, avoid using a dough docker. 

Over-risen dough
(i.e., over-proofed)

Decrease the dough rise. Over-risen dough collapses during baking. See the previous section on Over-risen Dough Balls.  

Unrisen (dead) dough

This problem is caused by (1) dead yeast, or (2) yeast killed in hot water, or (3) yeast accidentally omitted from dough. See previous section on Unrisen (dead) Dough.

 

37 - Crust collapses (shrinks in height) immediately after pizza is taken from the oven

 

Possible Causes

 

Remedy   

Incomplete coagulation of flour protein (i.e., gluten)

Increase pizza bake-time by 1 to 2 minutes. If that results in over-browning of the crust, you may have to drop the baking temperature. Also, see the previous section on Crust Too Brown All Over.

 

38 - Crust tough and leathery (especially after it cools down)

 

Possible Causes

 

Remedy   

Flour’s protein content is too high      

(1) Switch to a flour of lower protein content (maximum 12 percent), or (2) blend a lower protein flour with the current flour. For blending, see the section on Supplemental Flours & Meals in the Dough Ingredients chapter. Also, consider increasing the amount of oil or shortening in the formula up to 4 to 5 percent of flour weight.

 

39 - Crust flat and crackery

 

Possible Causes

 

Remedy   

Under-risen dough (i.e., under-proofed)     

Increase the dough rise. See previous section on Under-risen Dough Balls. In short, allow dough balls to rise (i.e., proof) more before rolling or stretching, and/or allow rolled or pressed dough to rise in the pan or screen before baking. If possible, avoid using a dough docker. 

Unrisen (dead) dough

This problem is caused by (1) dead yeast, or (2) yeast killed in hot water, or (3) yeast accidentally omitted from dough. See previous section on Unrisen (dead) Dough.

COMMENT: Flat, crackery crust is only a problem with those pizzerias desiring a risen, bready crust. Many establishments intentionally sell a pizza with flat, crackery crust—sometimes called “thin & crispy” or “thin & crackery.” This crust is typically made with a stiff, lean, lightly risen dough that’s flattened with a dough-roller or sheeter, and also sometimes perforated with a docker, as well.

 

40 - Crust flat, dense, and tough

 

Possible Causes

 

Remedy   

Severely over-fermented dough

Reduce amount of fermentation. See previous section on Over-risen Dough Balls.

 

41 - Crust lacks flavor

 

Possible Causes

 

Remedy   

Mismeasured or omitted an ingredient: ex., salt omitted       

Measure all ingredients—no gues­sing allowed. Provide thorough staff training, written procedures and good meas­uring utensils.

Inadequate fermentation

Increase dough fermentation (or rise). See section on Under-risen Dough Balls.

Crust under-browned

Increase crust browning by increas­ing bake time and/or temperature.

COMMENT: More crust flavor can also be achieved by adding ingredients to the formula. For ideas to test, see the Flavorings & Colorings section of the Dough Ingredients chapter. Brushing the crust edge with a butter-flavored oil also adds flavor. Some pizzerias sprinkle grated Parmesan or similar cheese over the oiled crust. Some also mist the edge of the dough with water and add seeds (i.e., poppy seed, sesame seed) before baking.

 

42 - Crust has peculiar flavor

 

Possible Causes

 

Remedy   

Poor ingredients: ex., rancid oil, spoiled non-fat dry milk solids, moldy yeast 

Make sure fresh, quality products are used.

Wrong ingredients: ex., accidentally used salt for sugar

Make sure ingredients are clearly labeled.

Excessive flour on crust

When baked, surface flour imparts a bitter flavor to crust. Make sure excess flour is removed from surface of rolled dough. See previous section on Excessive Flour Sticks to Rolled Dough.

Mismeasured or omitted an ingredient

Measure all ingredients—no gues­sing allowed. Provide thorough staff training, written procedures and good meas­uring utensils.

Dirty pans; rancid oil in pans

Check pans and wash if needed.

 

43 - Crust has doughy layer under the sauce (crust done on outside but raw inside)

 

Possible Causes

 

Remedy   

Bake time too short; oven temperature too high     

Lengthen bake time by 60 to 90 seconds and decrease oven temperature.

Pizza too cold going into the oven

(1) Use warmer (i.e., 60 to 70 degrees F) dough, sauce, and cheese, and/or (2) “double-bake” the crust by warming (pre-heating) it in the oven before applying sauce, cheese, and toppings. This is sometimes done with very thick pan-style pizzas with extensive topping.

Sauce too watery; tomato product has excessive syneresis (water separation)

(1) Add less water to the sauce, and/or (2) use a thicker tomato prod­uct, and/or (3) use a higher qual­ity tomato product.

Sauce applied too soon

Apply the sauce just before pizza is baked. (However, a thick, high-qual­ity sauce can be applied 2 to 3 hours before baking without causing a doughy layer.)

Discussion: Doughy Layer vs. Gummy Layer

Many people confuse doughy layer under the sauce with gummy layer under the sauce (discussed in next section). However, they’re distinctly different in appear­ance, cause, and remedy. Doughy layer is uncooked (i.e., ungelatinzed) dough. As a result, it has the appear­ance and texture of raw dough. Basically, doughy layer is raw dough that hasn’t yet cooked. So the main cure is more heat or longer bake time. Gummy layer—sometimes called gel layer—is cooked (coagu­lated) dough that is lacking air cells. During baking the cellular structure collapsed and the air dissipated, resulting in a dense, grayish, translucent mass with a gummy (gelatinous) texture. Because of its grayish color and gelatinous texture, some people crudely refer to gummy layer as “snot.” Gummy layer varies in thickness from very thin to almost the entire crust. It’s caused by excessive diastatic action in the dough. So the cure is to reduce diastatic activity. Unlike with doughy layer, extended baking will not eliminate gummy layer. For further discussion of diastatic action and gummy layer, see the Flour/Wheat sections of the Dough Ingredients chapter.


 


44 - Crust has gummy layer under the sauce

 

Possible Causes

 

Remedy   

Too much alpha-amylase; too much diastatic action in the dough         

If diastatic malt is used in the dough formula, eliminate or reduce the amount, or switch to non-diastatic malt. (Read about malt products in the Dough Additive section of the Dough Ingredients chapter. There are var­ious types of malt. Consult with a manu­facturer for details on what’s best suited for your situation.) If that doesn’t solve the problem, try a high­er quality flour or a flour without malted barley or other diastatic addi­tive. You may need to consult your flour company or dis­tributor for ad­vice.

Extended fermentation of retarded dough (too old).

Reduce holding time of retarded dough. Also consider reducing the amount of sugar. 

 

45 - Soggy crumb with grayish tint or translucent, gummy appearance


COMMENT: Gray, soggy crumb most frequently occurs in retarded dough that’s several days old. It’s a minor version of the same condi­tion that causes gummy layer. In short, it’s “gummy crumb.” The remedy is the same as for gummy layer
(described above).

 

 

46 - Crust is uneven thickness (thick edge, thin middle)

 

Possible Causes

 

Remedy   

Spinning the dough        

Eliminate spinning. Use more roll­ing, pressing, hand-stretching or slapping to stretch the dough.

Improper rolling technique; unequal pressure on handles

Put equal pressure on the rolling pin handles. In short, roll dough to uniform thickness.

Dough too soft

Use a slightly stiffer dough that doesn’t spread as easily.

 

47 - Crust is soggy or floppy (slice flops over when picked up)

 

Possible Causes

 

Remedy   

Crust too thin       

Increase the dough portion to create a thicker crust. Test a 20 to 30 percent increase for starters. This is the main remedy for floppy crust. If the crust is too thin, nothing else helps much.

Flour’s protein level is too low

(1) Switch to a flour of 1 to 2 percent higher protein content, or (2) add vital wheat gluten to current flour. In doing this, you may need to slightly increase the water portion and mixing time.

Dough too slack

Use a stiffer dough. See previous section on Dough Too Slack.

Incompletely baked (not fully done)

Bake to full doneness. Increase the baking time and, possibly, lower bak­ing temperature.

Excessive steaming in the box or on the tray

(1) Use a single-sided corrugated liner under the pizza in the box to help minimize crust steaming. (2) Possibly let pizza cool on a rack for 60 seconds before boxing or serving. (3) Consider putting a screen or trivet between the pizza and serving tray to vent the steam and prevent the crust from becoming water- and grease-soaked. (4) Deliver pizza to customer sooner.

 

48 - When parbaking, crust separates like pita or pocket bread

 

Possible Causes

 

Remedy

Unequal top vs. bottom heat  

Adjust oven fingers, baffles, and/or temperature controls to achieve equal amount of top vs. bottom heat. On a pizza oven, this usually means reduc­ing the bottom heat. If that can’t be done, experiment with put­ting an extra pizza screen or two under­neath the pan or crust.

Too high baking temperature

Lower the baking temperature and, possibly, lengthen the bake time.

Under-proofed dough

Proof dough to a higher rise. For thick, pan-style crust the rolled dough should be pan proofed to at least double in height. See previous Discussion on Crust Bubbling in this chapter. Also see previous section on Under-risen Dough Balls.

High percentage of water in dough formula

Reduce the water portion in the dough formula by 2 to 4 percent of flour weight. This can help reduce the presence of super-large (pita-bread style) bubbles.

 

49 - Crust made from retarded dough has small blisters


REMEDY: This condition can be reduced by shortening the holding time of retarded dough. However, tiny blisters don’t hurt anything—in fact, some people think they make the crust look better. So you’re best off by not worrying about them.

 

 

50 - Crust sticks to pan or screen

 

Possible Causes

 

Remedy   

Unseasoned pan or screen         

Season new pans before using them. (See following discussion on How to Season Pans.) Thereafter, only wipe them out with clean cloth or paper towel and don’t wash them. If the health department requires washing be­tween uses, use mild detergent and brush. Do not soak them in caustic carbon-cutting chemical or scrub them with steel wool or nylon pad.

No oil in pan

Oil the pan before putting in the dough. With a seasoned pan, only a thin coating of oil is needed to elimin­ate sticking.

How to Season Pans

  1.   CLEAN AND DRY. If not already clean, clean the inside surface of the pan. Dry the pan completely before seasoning.

  2.   COAT WITH OIL. Apply a thin coating of corn oil to the dry inside bottom and side of the pan. To do this, use a clean cloth. Fold the cloth into a square, dip a corner into the oil, and wipe the oily cloth around the pan. Cover the entire inside surface, but don’t use so much oil that it runs if the pan is tilted.

  3.   BAKE pan at 600 degrees F for 20 minutes.

  4.   RUB WITH SALT. After removing the pan from the oven (and while the pan is still hot), add a tablespoon or two of salt to the pan. Using a clean cloth, rub the salt against the bottom of the pan. Especially, rub the areas where the oil may have collected during baking and formed a thicker (but softer) carbon coating. After rubbing, empty the salt from the pan. It can be re-used in subsequent pans. The purpose of rubbing with salt is to remove loose carbon. To thoroughly rub a pan takes about 10 seconds. Wipe out the salt and apply a thin coating of oil.

  5.   TEST BEFORE USING. After seasoning, test the pan to insure that it won’t stick with pizza crust. To do that, let the pan cool, then sprinkle a small amount of mozzarella cheese (about 1/2 oz) over the bottom of the pan. In an oven set at pizza baking temperature (about 500 degrees F), bake the pan until the cheese particles turn completely brown—this takes about 3 minutes. Remove the pan from the oven and, with a nylon spatula, scrape out the cheese particles. If the pan is properly seasoned the particles will break loose from the pan with light to semi-firm scraping pressure. If it’s not properly seasoned, the cheese will stick hard and will not yield to the scraper. If the cheese breaks loose from the pan but only after a few extra-hard scrapings, re-season the pan again. If the cheese sticks hard after a second seasoning, the pan may need to be discarded.

     Always season a new pan before using it. When a pan is used before seasoning it becomes more diffi­cult to season afterward.

 

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