Spread oil in your hand,crumble the left over idlis.

Take a kadhai, add oil,mustard seeds,chanaDal, urad Dal,turmeric,green chillies,asafoetida,curry leaves.

Allow them to crackle,then add crumbled idlis,saute it in oil for few minutes,add salt,then put off the stove.

Garnish it with coriander leaves.