Chop drumsticks into 4 inch pieces.
Chop the tomatoes and blend it into a smooth puree.
Grind the coconut to a smooth paste.
Heat oil in a kadai.
Add mustard and allow it to sputter.
Add curry leaves.
Add tomato puree and saute till the oil separates from the sides.
Add drum stick pieces and saute for 4 to 5 minutes.
Add a cup of water and add half of the salt now. Allow it to boil.
When the drum sticks are half way cooked through, add turmeric powder.
Add chilly powder and mix well and let it boil for 3 minutes.
Add coriander powder.
Add garam masala powder and let it cook for another 3 minutes.
Add coconut paste.
Mix well and cook for five minutes.
Add the remaining salt now.
When the gravy starts thickening, switch off the stove. Add fresh curry leaves.
Now the drum stick curry is ready. Serve it hot along with plain rice accompanied by vegetable stir fried. You can have it as a side dish for idly, dosa and appam.