Onion Vatha Kuzhambu (Onion cooked in spicy tamarind gravy)

This is a tangy and spicy gravy that goes well with rice and curry. Vegetables like ladies finger, capsicum, sweet potato, drumstick, brinjal can be used instead of onions. Some call it Kaara kuzhambu.

Ingredients:
1 medium sized onion sliced
1 tbsp sesame oil
1 tsp mustard seeds
1 tsp fenugreek seeds
1 tsp thur dal or channa dal
A few curry leaves
3 tsp sambar powder
Salt
1/4 tsp hing
3.5 cups tamarind extract from small lime size tamarind
1/2 tsp jaggery
1 tsp rice flour

Method:
Heat oil. Add mustard seeds, fenugreek, channa dal or thur dal, curry leaves.
When mustard seeds crackle and dal turns brown, add sliced onion and fry till it turns soft.
Soak tamarind in warm water for 10 minutes and extract 3.5 cups of juice from the same.
Add this juice to the cooked onion.
Add salt, sambar powder, hing and allow the mixture to boil for 20 minutes or until oil starts to float on top.
Add jaggery if you like the gravy to be slightly sweet.
Mix rice flour in 1 tsp water and make a thick paste.
Add this paste to the tamarind gravy and stir continuously until the mixture becomes little thick.
Serve with rice, ghee and curry.