Combine raw rice and parboiled rice in a bowl. Wash thoroughly and soak overnight. Similarly, combine all the lentils in a bowl. Wash thoroughly and soak overnight along with the red chillies.
Grind the rice with water. The resulting dough should not be very smooth. It should be slightly grainy. Transfer the batter to a big mixing bowl.
Grind the lentils and red chillies with water. Again, the resulting batter should not be smooth. It should be slightly grainy. Transfer the batter to the same mixing bowl.
Now mix the rice batter and lentil batter.
Add salt, chopped curry leaves, onion, and roughly chopped moringa leaves. Rest the batter for about 15 minutes.
Now, heat the pan. Take a ladle full of batter and spread it gently on the pan. The Adai should neither be too thick (like a pancake) nor too thin( like a crepe or dosa). Make a small hole in the middle with the help of a spatula. Put a teaspoon of oil along the edges, in the hole, and on the surface. Keep the heat on medium.
Now turn the Adai and apply some oil on the surface. On medium heat, cook it. Once it is cooked and the surface gets a bit brown, remove it from the pan.
Serve immediately with butter or chutney.