1/4 cup-raw rice
1/4 cup-moong dal
1/4 cup-toor dal
1/4 cup-chana dal(kadala paruppu)
Wash and soak all the above together in water. Wait for 2 hours or 3 hours(if you have time).
Grind the mixture along with 4 red chillies, 2 green chillies and asafetida(hing- 1 spoon) and salt in a mixer/grinder to form a batter. The batter should not be very watery. It can be moderately thick.
Now you may use this immediately to prepare dosas.
Onion tomato chutney:
Heat oil in a kadai. Add mustard. Once it splutters, add chana dal, jeera,curry leaves,4 red chillies,turmeric powder,salt and fry for sometime. Now add onion(1 big onion) and 1 tomato(both chopped into fairly big pieces) and sauté them well till the raw smell of onion and tomatoes are gone.
Once they are sauted well, allow it to cool and then grind it without adding water.
Chutney is ready to be served with adai mentioned above.