Wash and soak the urad dhal and rice for 30 minutes.
Drain the water and grind into a soft batter by sprinkling little water.
Add the chopped onion ,green chillies , coriander leaves , curry leaves ,pepper corns and salt , mix well.
Heat the oil in a kadai.
Shape into round like doughnuts and fry in hot oil till golden brown.
Crispy ulundu vadai is ready to serve.
Serve with sambar / chutney.
Soaking for 30 minutes is enough , or else absorbs more oil.
The consistency of the batter must be correct , if you feel the batter is more watery can add few spoons of all purpose flour.