Soak kala chana overnight. Next day pressure cook it (4 whistles).
Grind together coconut, tamarind and red chillies.
Cook the raw banana with a little salt separately in a different vessel, as the raw banana cooks fast.
Now in a vessel pour the ground masala, add the boiled chana , banana. Add salt and give it a boil for 5 to 7 mins, remove from heat.
Heat oil, add mustard seeds, when they start popping, add curry leaves and asafoetida and season the curry.