Soak in Tour Dal, Channa Dal, Urad dal, Raw Rice, Idli rice for about 3 hours. After soaking take the soaked dals and rice along with Dry Red chilies, Cumin seeds, Pepper, Curry leaves, and Hing in a blender. Grind it to a coarse batter.
Mix water along with the batter the consistency should be similar to idly batter. Not too runny and not too thick. In a Kadai add in oil once the oil becomes hot add in Mustard seeds let it splutter and then add the channa dal and curry leaves.
Then add in the finely chopped onions and fry till it becomes translucent. Add this to the ground batter.
Along with this add in salt and freshly grated coconut to the batter and mix well.
Take a Dosa tawa (I used my iron dosa kal) . Wait till the dosa pan becomes hot and then take a ladder full of batter and spread like how we do for dosa. Pour oil along the sides. Once it's cooked flip and cook the next side also. Healthy Dal Adai is now ready !!