Onion Tomato Curry

1 large Onion, chopped fine
3 large Tomatoes, very ripe ones, chopped
4 Green chilies, minced
½ tsp Mustard seeds
½ tsp Urad dal
2 tsp Oil
Salt
¼ cup Besan / Senagapindi
Cilantro - to garnish

Heat oil. Add mustard seeds and urad dal. When dal turns reddish brown and seeds pop, add the green chillies and onion. Fry till onions turn translucent. Then add the tomatoes and salt. Saute for few minutes.
Make a smooth paste of besan with water and make sure there are no lumps. Stir this into the curry, stirring all the while so no lumps are formed. If necessary add some water and cook for a few minutes until desired consistency is reached. Garnish with freshly cut cilantro. Serve with spicy pulav.