MW the drumstick pieces for 5 mins. Keep it aside.
Heat oil in a nonstick pan, add cumin seeds, curry leaves. Saute for 2 minutes, then add chopped onion and fry till onion become light brown.
Next add Drumstick pieces,turmeric powder, red chili powder, salt to taste and simmer for few minutes till the spices is mixed well.
Now add nut paste and add 1/2 cup water. Bring to a boil, and cook till the thickness you like.
If you are serving with rice, it can be little thicker, else make a thin gravy.
Serve with rice or roti.