1. Soak the three dals together for about 2 hrs and then drain them and keep aside.
2. Separate the mint leaves, wash well and keep aside.
3. Using a food processor, grind all the ingredients into a coarse paste adding little water as possible.
4. You could also use a blender to grind the dals.
5. Make sure that you can grind it adding minimal water.
6. Heat oil in a kadai and shape the ground mixture in the shape of vadai and deep fry until golden brown.
7. Drain on an absorbent paper and serve hot with chutney or ketchup.

Recipe courtesy: My Cooking Journey