Sourdough

Sourdough is a leavening agent containing naturally occurring yeast and lactobacillus bacteria. The term is used to describe bread baked with sourdough, while the sourdough itself is referred to as a starter. In addition to leavening the bread, the fermentation process produces lactic acid, which gives the bread its distinctive sour taste and improves its keeping qualities.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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