Heat a pan with a tea spoon of oil and cumin seeds. As they splutter include drumstick leaves and saute till the leaves wilt. Throw a green chilly in to the pan and switch off.
In a mixer jar add coconut, salt and all sauteed ingredients from above step. Grind all of them together to fine paste adding little water. Transfer the ground paste in to a bowl and combine with buttermilk.
Heat a seasoning pan adding oil, mustard seeds, lentil, curry leaves and red chilly. As the mustard seeds pop transfer the seasoning to tambli.
Nutritious drumstick leaves tambli is ready. Serve it with steamed rice and relish during summer.