Biga

Biga is a firm, barely hydrated preferment central to many classic Italian breads and some pizzas. It is mixed from flour, water (50–60% of the flour weight), and a small quantity of commercial yeast — typically 0.2–1% — then left to ferment at cool room temperature (16–18°C / 60–65°F) for 12–18 hours, or at lower temperatures for longer. The low hydration and cool environment slow fermentation dramatically, encouraging a long, complex development of organic acids, esters, and carbon dioxide without the yeast population exhausting itself. The resulting biga is stiff, slightly domed, and riddled with internal gas channels. When incorporated into a final dough it contributes pronounced open crumb structure, a wheaty-sweet depth of flavor, superior crust color, and markedly improved keeping quality. Hydration percentages below 50% produce what bakers call a 'very stiff' biga, used for breads like Altamura-style loaves; percentages creeping toward 65% tip the preferment into poolish territory. Standard biga uses 20–40% of the total flour weight. Ciabatta, Pugliese, many panettone formulas, and Roman-style pizza in teglia all rely on biga as a foundational building block.

“The baker mixed a 50% hydration biga the night before, letting it ferment in the cold corner of the kitchen so the ciabatta would have that signature open crumb and nutty, slightly tangy flavor the next afternoon.”

• ConceptPreferment
• TechniqueAutolyse
• glossaryPoolish

1. 1.The Bread Baker's Apprentice — Peter Reinhart (Ten Speed Press, 2001)
2. 2.Advanced Bread and Pastry — Michel Suas (Delmar Cengage, 2009)
3. 3.Modernist Bread — Nathan Myhrvold & Francisco Migoya (The Cooking Lab, 2017)
4. 4.Il Pane Fatto in Casa — Anna Gosetti della Salda (Fabbri Editori, 1982)

Confidence: high