Description
Fermentation of rice‑urad dal batter creates the airy, tangy base for South Indian dosas.
Technical
Lactic acid bacteria convert sugars to lactic acid while yeasts perform alcoholic fermentation, generating CO₂ that leavens the batter. Proteolytic enzymes from urad dal hydrolyze proteins into peptides that act as natural emulsifiers, improving foam stability. Starch‑hydrolyzing amylases release maltose and glucose, fueling microbial metabolism and contributing to the characteristic sweet‑acid flavor profile.
Culinary Significance
Creates the characteristic sour aroma, improved crispness upon cooking, and digestibility of traditional dosa.
Science
Primary Reaction
Lactic acid fermentation (heterofermentative) coupled with alcoholic fermentation
Parameters
Temperature
30°C optimal
22°C to 38°C range
Time
12 hours
8 hours – 18 hours
Equipment