Peel and cut potatoes. Cut into medium to small size dices. Put the in the pressure cooker along with 2 glasses of water (around 500ml) and some salt. Let it whistle once or twice on low flame. Heat oil in a pan, crackle mustard and then add jeera. Wait till jeera turns a brown. Be ready with the boiled vegetables along side. Add curry leaves, green chillies, asafoetida, turmeric and Chilli powder. Quickly and boiled vegetables along with it's water.
Add tomatoes and all the remaining spices. Also add salt and water if required.
Cover and simmer on low heat till the tomatoes are tender, curry is thick enough and oil is clearly seen on the surface. Serve with rotli/Puri/paratha and rice.
