Soak chana overnight, drain water add it to a pressure cooker, cover with fresh water, add little salt and pressure cook this for 15 to 20 whistle till chana gets soft. Set aside.
Grind all the ingredients given for grinding to a smooth paste. Set aside.
Heat oil in a kadai. Add in onions and curry leaves. Saute till onions turn golden.
Add in tomatoes, salt, turmeric and cook till mushy.
Add in brinjal and drumstick along with some water. Cook covered till veggies are half cooked.
Now add in the chana along with cooking liquid.. Add in coconut paste and mix well.