1.Separately wash black gram and foxtail millet rice with water.
2.Add methi seeds to the black gram and soak the mix for 4 hours.
3.Soak foxtail millet rice separately for 4 hours.After soaking, grind black gram and foxtail millet rice separately into a smooth batter.
4.Mix both batters and allow to ferment for about 4 hours. In cold weather, ferment overnight.
5.Mix chopped onion, green chillies, coriander leaves, cumin seeds, curry leaves and salt to the fermented batter and mix well.
6.Heat oil in a pan for deep frying.
7.Make small round balls with the batter and flatten them lightly.
8.Deep fry these in hot oil on a medium flame till they turn brown.
Kangu vadas are ready to be served hot with chutney!
Note: You can prepare vada with kodo millet rice, proso millet rice, banyard millet rice or little millet rice with the same process.