While grinding, at first, put only the jowar in the machine. After sometime, put rice. Add some water. Then later, add urad dal. Grind all of them together to a smooth batter.
Remove the batter in a big bowl, allow to ferment for six to eight hours.
Add salt to it.
Mix the batter and take some in a small bowl. Heat a skillet, pour a ladle full of batter and spread it inside out to a thin crepe. Drizzle some oil.
Allow to cook. Flip it to the other side. After two minutes, remove and serve.
Notes
Make a small quantity of batter and finish it within a day or two.