- Wash the flattened rice. Soak it for ten minutes. Mash it with a ladle. Add curd and idli rawa to it. Put salt and mix it. Keep it aside for twenty minutes. Heat a idli cooker. Add soda to the batter, mix it and immediately put it in the moulds. Cook it on moderate heat for twenty to twenty-five minutes. Once they are done, turn off and keep it aside for sometime. Remove and serve with coconut chutney.