Soak the rice and lentils in water for at least 6 hours or overnight.
1 ½ cup brown rice, ½ cup yellow moong dal, ¼ cup urad dal, ½ cup chana dal
Drain the water and grind the soaked rice, lentils, red chilies, ginger, and cumin seeds into a smooth paste (with enough water)
5 red chilies whole, 1 teaspoon cumin seeds, 1 inch ginger, 2-3 cup water
Add salt to taste and chopped cilantro to the smooth batter and mix well. (adjust the batter consistency by adding more water.)
1 tablespoon cilantro chopped, 1½ teaspoon salt to taste
Heat a non-stick pan or tava on medium flame.
Grease it with oil, pour a ladleful of batter, and spread it in a circular motion to make a thin adai dosa. (you can also make thick dosa like pancake or uttapam)
Drizzle oil around the adai dosa and cook until both sides are golden brown.
Serve hot with chutney and sambar.