Rinse and wash urad dal and pearl millet seperately.Soak urad dal and fenugreek seeds in a bowl, then in a seperate bowl soak kambu.Let it soak for atleast 5-6 hrs.

Add kambu first to the grinder and while its coarse add urad dal+fenugreek seeds and grind it a smooth batter adding required water.Sprinkle water then and there to avoid sticking.Collect it in a container

Add required salt,, close the container with a lid. and ferment it overnight,set aside in a warm place.Then the next day you can see the batter has rised, then add little water to make it little runny so that its easy to spread.

Heat dosa tawa, then take a laddle full of idli dosa batter - In medium flame add the dosa batter to the dosa tawa and keep spreading in circular motion outwards.Drizzle oil,when the dosa gets slightly browned turn over to other side and cook for few seconds then flip over and fold it.

Your dosa is ready! Serve with idli podi / any chutney of your choice.