Why does pizza dough taste better after a slow rise?

Same flour, same water, same yeast, same oven. One dough mixed at five and baked at seven; another mixed the day before and left in the fridge. The second almost always wins: a crust that tastes of something, bubbles in the rim, and a dough that stretches instead of snapping back. The secret ingredient is time, and you hardly have to do anything with it.

What happens while dough rises

Fermentation is more than inflation. Wikipedia's entry on proofing explains the chain: enzymes in the flour and yeast create sugars from the flour's starch, the yeast feeds on them, and it produces carbon dioxide gas, which makes the dough rise, and alcohol, which gives baked bread flavour. In sourdough, bacteria also produce lactic and acetic acids that add more flavour.

A fast, warm rise does all of this in a hurry. The dough fills with gas quickly, but there is little time for flavour to build. Bake it and you get something that looks like pizza and tastes politely of flour.

Why cold and slow is better

The same page describes retarding: putting dough in a refrigerator or other cold place to slow the yeast. Lowering the temperature, it notes, gives a slower, longer rise with more varied fermentation products and more complex flavours. That is the whole case for the fridge rise in one sentence.

Bakers use the same logic with pre-ferments. Wikipedia's pre-ferment entry says that a longer fermentation gives yeast, enzymes and, in sourdough, bacteria more time to act on the dough, creating greater complexity of flavour. The Italian version is the biga, a yeasted starter made ahead and mixed into the final dough.

Why it stretches better

Kneading and mixing build gluten, the stretchy network that holds the gas. Freshly worked gluten is springy and fights back: you stretch the dough and it shrinks. Give it a long rest and the network relaxes, so the dough opens up easily into a thin base with a puffy edge. If your pizza dough keeps springing back, it usually wants more time, not more force.

How to plan a fridge rise

The beauty of a cold rise is that it fits around life rather than the other way round.

• Mix the dough the day before (or in the morning for dinner the next day), using a little less yeast than a same-day recipe would. Less yeast plus cold equals slow.
• Let it start at room temperature for a short while, so the yeast gets going.
• Divide into balls, put them in lightly oiled, covered containers or a tray covered well, and refrigerate.
• Take them out in good time before baking, so they lose their chill and feel soft, airy and slightly puffy. Cold dough is stiff and tears.

Watch the dough rather than the clock. Ready dough has grown noticeably, looks smooth and domed, and springs back slowly when you press it gently with a floured finger. If the dent springs back fast, it wants longer; if it doesn't spring back at all and the ball has slumped, it has gone a little far but will still bake.

When the plan changes

• Dinner is postponed? The dough can usually wait another day in the fridge. It will get more flavourful and a little slacker.
• No time for a long rise? Make it the same day anyway. Pizza from a quick dough is still pizza, and still welcome.
• Too much dough? Wrap extra balls well and freeze them after their first rise. Thaw in the fridge.

Getting the most from it in the oven

A good dough deserves a hot oven: the hottest setting you have, a well-preheated tray, stone or steel, and toppings kept light. Our guide to pizza in a home oven covers the rest. The same slow-rise thinking works for focaccia; see focaccia bubbles.