Vengayam Thakkali Gothsu / Onion and tomato gotsu

Name: Vengayam Thakkali Gothsu / Onion and tomato gotsu
Prep time: 5 min
Cook time: 15 min
Total time: 20 min
Cuisine: Indian
Ingredients: 1 cup Onion (finely chopped); 2 cups Tomato (chopped); 2 tsp Ginger (grated); 3 Green chilies (chopped); 1 teaspoon Mustard seeds; 1 teaspoon Cumin seeds; 2 teaspoon Urad dal / Ullutham Paruppu; 1 Tablespoon Oil; 10 Curry Leaves; 1/4 cup Tamarind extract (extracted from a small marble size tamarind or use 1/2 tsp tamarind paste); 1 teaspoon Jaggery /brown sugar; to taste Salt