- Wash and soak the moong dal overnight. Next day, drain the water and tie the moong dal in a muslin cloth. Keep it out for 8 hrs. Meanwhile, soak the urad dal along with Methi Seeds for 2 hrs. After 2 hrs, grind the sprouted moong dal to a smooth paste. Drain the urad dal and grind to a smooth paste separately. Mix together and add salt. Keep it covered and let it ferment for 2 hrs. When ready to pour,grease the idli moulds,and pour the batter. and steam for 10 minutes. Serve with spicy chutney.