Heat 2 teaspoon oil in a pan - add 1 teaspoon mustard seeds let it splutter, then add 1 teaspoon urad dal and 1 tablespoon chana dal.
Fry till golden brown.Then add 1 big green chili(finely chopped),a pinch of hing, 1/2 teaspoon ginger(finely chopped) and 1 tablespoon curry leaves(finely chopped). Give a quick saute.
Then add 1/ cup onion(finely chopped), required salt saute till transparent.
Add this tadka to 2 cups idli dosa batter.
Add 1 tablespoon coriander leaves(finely chopped).
Mix it well, add water if needed. The batter should be semi thick, Set it aside.
Heat oil in a paniyaram pan. Add 1/4 teaspoon oil in each hole. Swirl the pan so that oil gets coated evenly in each hole.
Add batter in each hole. Add till 3/4th as the paniyarams will rise a bit.
Cook covered for few mins until the top looks cooked.Cook in low medium heat. Do not let the water droplets drop inside, so when it starts just open and flip over for a crispy paniyaram.
Open when the top looks cooked like shown then you can flip over.
Flip over to other side.
Cook for 2 minutes then remove, transfer to a plate. Now proceed with next batch.
Repeat to finish the batter.
Crispy paniyaram is ready!