Grind Green peas 1 cup, ginger 1 inch, green chillies -2 into a fine paste.

Add 1 cup rava, 1 cup curd, salt.

Keep aside for 15 mins. 

Tadka:

Heat 1 tbsp oil, add mustard seeds, hing, curry leaves. Add to the paste. Add water if required to get idli batter consistency. 

Add eno 1 tsp to the paste before steaming. Mix lightly & steam like idli for 20 minutes. Add cashews if you like. Serve with coconut chutney.