Ingredients for sambar. Boil tur dal in a pressure cooker in 3 cups of water, salt and turmeric powder at medium heat for 3 whistle. When its done, turn of the heat and let it cool down naturally.
Heat oil and ghee in a pan at medium heat. Add mustard seeds, wait till it crackles. Add red chili, hing( Asafoetida ) and curry leaves, stir it for few sec or until slightly brown.
Add onion and little salt and saute it for 3 min at medium heat.
Add all cut vegetables and 1/4 tsp turmeric powder, saute it for 3-4 min.
Add coconut and jaggery and sambar powder, saute it for 2 min.
Add boiled dal, Tamarind paste and 3 cups of water.
You could cook it in an pan with covered lid at medium heat for 10 minutes until vegetables are cooked or in pressure cooker until one whistle.