2 Cup White Rice
1/3 cup Blackgram seeds
1/2 cup Avalakki/Poha
10-15 Fenugreek seeds/Methi seeds/Menthe kaalu
Salt to taste
3-4 Green Chilly
10-12 Coriander leaves
Soak rice, blackgram seeds, fenugreek seeds together in water for about 6-7 hrs. Wash soaked ingredients 2-3 times and keep it aside.
Grind soaked ingredients along with avalakki/poha into smooth thick batter by adding sufficient amount of water. Keep it in warm place for fermentation for about 10-12 hrs.
Add salt, required amount of water and mix it well. The consistency of the batter should be that of milkshake.
Chop onions, coriander leaves, green chillies into very small pieces, mix well and keep it aside.
Heat the Tava(Iron Tava preferred). Pour a spoonful of batter spread it over the Tava. Spread chopped onion mixture all over the dosa and stick it well by using hand as shown in the picture below. Add 1 tsp of oil/ghee on top of dosa, cover it in a lid and cook it for a minute in medium flame. Cook other side of the dosa as well for about 1 min.
Serve hot with any chutney or sambar. Ingredients mentioned above will serve 12-14 Onion Dosas.