Heat oil, add cashew nut pieces, fry and remove.
In the same oil add mustard seeds.
After they splutter, add dal, curry patta, green chillies, ginger and finally rawa.
Roast for 5 to 7 minutes.
Remove from fire.
Add salt, cashew nut pieces, and soda-bi-carbonate, and cool.
Add curd, corriander leaves and grated coconut.
Mix well and steam the idlis immediately.
Makes 10-12 idlis.