Rinse and wash 2 cups of raw rice , 1 cup regular rice and 1 cup Idli Rice. Soak in water for 3-4 hours.
In a bowl add ½ cup chana dal , ¼ cup urad dal , ¼ cup moong dal , ¼ cup toor dal ,rinse and wash thoroughly. Soak all dals together for 3 hours.
After 3 hrs , drain water and keep it aside. Reserve this water to add while grinding the batter.
In a wet mixer grinding jar, add rice , 5 dry red chillies, asafoetida and grind to a smooth paste, add the reserved water portion by portion as required.
Transfer the batter to a seperate bowl .
Now to the same jar , add all soaked dals and grind to a coarse paste , add little reserved water as needed.
Add this coarse grind dal batter to rice batter , add salt , mix well and set it aside for 2-3 hours. Batter consistency should be of regular Dosa consistency , neither too thick nor too thin.
Chop shallots ( about ¾ -1 cup) , green chillies (2-3 no's) , curry leaves 4-5 sprigs and 4 tbsp of coriander leaves . Add this to batter and mix well.
Heat griddle/dosa tawa , Pour a ladle full of batter and spread like a dosa. Drizzle some ghee/ clarified butter/oil on top of the dosa , close the lid and cook for 30 - 40 seconds.
Open the lid , flip the dosa to other side and continue to cook ,till done.
Drizzle some more ghee and serve hot . Adai should be served hot only , it becomes rough once it cools down.