Soak black gram for 1 hour and grind it.

Mix 3 times idli rava and keep the batter for 8 hrs.

Prepare idli from that rava.

When idli becomes cold, smash it and make it as normal mixture.

Heat oil in a pan or a kadai.

Splutter mustard seeds.

Add a pinch of asafoetida, curry leaves and green chillies.

Add chopped onion and fry till they turn golder brown in color.

Add idli mixture, salt, lemon juice and a bit of sugar.

Mix it properly and keep it for 3 - 4 mins to cook.