For masala:-chop onion and tomatoes. Now heat oil temperd mustard seeds, asofotida,chop green chilli,curry patta, urad dal,chana dal,add grated ginger salt onion,tomato, red chilli,turmeric saute add sambhar masala chopped coriander chopped tomatoes saute add 1 glass water cover and cook for 5-7 mins on mid flame