1. Cut drumsticks into 2 inch pieces.
2. Boil drumsticks with enough salt and water.
3. Boil till the drumsticks are tender and keep aside.
4. Grind the ingredients of the gravy to a smooth paste.
5. Heat oil in a pan and add the chana dal, urad dal and mustard seeds and fry till the mustard seeds splutter add the dry red chillies and curry leaves.
6. Add the drumsticks along with boiled water.
7. Add the ground gravy paste.
8. Add enough water and keep stirring as it sticks to the bottom. Serve hot.

Tip:
Add little more water than usual as the gravy thickens as it becomes colder.