Soak all the dals in plenty of water for 4-6 hours. There are specs of black urad dal skin. Add salt and mix well.

Take required amount of batter in a bowl. Add water proportionately and mix well. The batter should have regular dosa batter consistency.

Heat a dosa tava. Once it is very hot, lower the flame and pour a ladle full of batter. Spread on the same direction. Add oil to the edges and little bit in the middle.

Flip and cook till the dosa turns crispy and golden. Serve mixed dal dosa hot with chutney.