For idli batter- soak all idli ingredients for 3 hours. Wash wel drain water and grind to a smooth thick frothy.add water while grinding if needed.add liltle water.grind little coarsely.take idli batter in a untensil and set for 5 to 6 hours in a warm place until the batter ferments and rise wel.the batter must rise and turn up fluffy but not turn sour