firstly, in a pressure cooker take 3 tsp oil and saute spices.
now saute 1 onion, 2 green chilli and 1 tsp ginger garlic paste.
also, saute 1 cup tomato until it turns soft and mushy.
furthermore, add spices and 1 tsp salt.
saute on low flame, till the oil releases from tomato.
now add 1 cup black chana or kala chana soaked overnight. saute for a minute.
add 3 cups of water and mix well.
cover and pressure cook for 8 whistles or till chana get cooked completely.
now add ½ tsp garam masala, 2 tbsp coriander and mix well.
finally, serve kala chana curry with rice or roti.