Description
Microbial fermentation of rice and urad dal batter creates air pockets and sourness for crispy, digestible crepes.
Technical
Lactobacillus spp. (L. plantarum, L. fermentum) and wild yeasts (Saccharomyces cerevisiae) metabolize carbohydrates, producing CO2 (leavening), lactic acid (pH 4.5-5.2), and volatile compounds (diacetyl, acetoin). Proteases from urad dal partially hydrolyze gluten-like proteins.
Culinary Significance
Critical for achieving dosa's signature crispness (via CO2), tangy flavor (lactic acid), and reduced cooking time (starch pre-digestion).
Science
Primary Reaction
Lactic acid fermentation
Parameters
Temperature
28°C optimal
20°C to 38°C range
Time
12-18 hours
8 hours – 36 hours
Equipment
Stone grinder (optimal starch damage)Earthenware pot (microporous)Cheesecloth cover