Soak Bengal gram/chana dal for 3 - 4 hours and strain it.
Peel and wash ridge gourd and chop it.
Heat oil in a pressure cooker'
Add cumin seeds and whole red chilly to crackle
Add ridge gourd ,Bengal gram,turmeric powder and cover the lid and steam it.
When cooker release the whistle simmer the flame for ten mins.
Once cooled open the lid an d cook for 5 -7 mins till water absorb it.
Add salt and cook for 5 mins.
Serve with steamed rice.
