A portion of bread dough that is fermented before being added to the final dough mixture, used to develop flavor and improve texture. Common types include poolish, biga, and sponge, each with different hydration levels and fermentation times.
From 'pre-' meaning 'before' and 'ferment,' literally meaning 'fermented beforehand.' The technique has ancient origins but was systematized in French and Italian baking traditions, with different cultures developing their own specific preferment styles.
Preferments are like flavor time machines for bread - they allow bakers to capture the complex flavors that develop during long fermentation and concentrate them into the final loaf. A poolish (liquid preferment) might ferment for 12-16 hours, developing acids and esters that would take days to achieve in a straight dough, while also improving the bread's keeping quality and crumb structure.
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