Now add bottle gourd pieces, toor dal, onions, tomatoes, green chillies, and tamarind and turmeric powder in a cooking vessel and cook till the dal becomes tender.
(If you want you can do this in a pressure cooker also. 2 to 3 whistles are enough)
Switch off the stove. Now take a separate pan and heat with 1 tsp of oil.
Add mustard seeds, cumin seeds, curry leaves and asafoetida.
When they start to crackle add the chopped onions.
