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Definition of Sponge

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100% Sourdough Rye Bread - Starter, cut into pieces
grongar/Flickr/CC BY 2.0
Definition: Sponge is a wet batter that has yeast added to it. A sourdough bread starter is often called a sponge because the yeast has create bubbles in the moist batter and makes the batter sponge-like.
Also Known As: sourdough bread starter

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