Wash and soak the rice and udad dal separately for 6-8 hours.

Drain the water and keep aside

Grind the udad dal to a thick consistency, adding water.

 You will know when to stop when you see the batter bubbling up a little.

Now grind the rice.

Mix the two batters stirring clockwise and anti-clockwise.

Add salt and cover. Leave it to ferment overnight.

Stir well, add water if the batter is too thick. Add salt if required.

Prepare the non-stick pan by heating it.

Grease the pan with a little oil.

Spread the dosa batter evenly on the pan.

Cook the dosa till one side is crisp and brown.

Fold and serve hot with chutney and sambar.