firstly, pressure cook ½ cup toor dal, 1 tomato, ¼ tsp turmeric and 1½ cup water for 5 whistle.
in a kadai heat 3 tsp oil and saute 1 tsp mustard, pinch of hing, 1 dried red chilli and few curry leaves.
also saute 2 green chilli and ½ onion for a minute.
now add ½ cup tamarind extract, ½ tsp jaggery and 1 tsp salt. mix well.
boil for 10 minutes or till tamarind extract gets cooked well.
add in whisked dal and tomato. mix well.
also add 1½ cup water and adjust consistency. boil well.
furthermore add 1 tbsp of sambar powder and stir well.
add in 1 tbsp ghee and boil for 2 minutes.
finally sambar is ready to serve with vada or idli.