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Idli batter ferments due to the activity of naturally occurring microorganisms, primarily lactic acid bacteria and yeast, which thrive in a warm environment. When left at room temperature overnight, these microorganisms metabolize the carbohydrates in the batter, producing carbon dioxide gas that causes the batter to rise. The fermentation process also enhances the flavor and texture of the idlis, making them light and fluffy. However, if left too long, the batter may become overly sour or spoil.

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AnswerBot

1mo ago

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