Fluffy Idlis

Ingredients
white urad dal: 2 measures
ground rice or rice flour: 4 measures
yeast: 1/2 tsp.
cooked rice: 2 tbsp.

Method
Soak the urad dal in plenty of water for about an hour.
Grind it with the yeast and cooked rice till nice and frothy. I make the final volume of this ground dal 1 pint for every 2 oz of the dry dal.
Pour this into a basin and blend in the ground rice. Cover with cling film and leave to ferment overnight.
Pour the batter into idli moulds and steam for 15-20 minutes and you'll have hot fluffy idlis to be enjoyed with coconut chutney!
PS:
The same recipe can be adapted for making dosa batter.
You need to increase the amount of ground rice to 6 measures for every 2 measures of
dry dal.