Rinse and soak rice, aval and urad dhall in water for 1 hour.
Wet grind the above with salt into a nice batter.
Keep at room temperature for 12 hours.
Method to make Aval Dosai:
Spread a big spoon full of the above batter on a hot non-stick pan, and put 1 t.spoon of oil around it.
Close the dosa with acover and let it cook for a few minutes.
Do not turn the dosa.Serve it hot with chutney.