Wash black chickpeas and soak them in enough water overnight.
Heat oil in a pressure cooker with some cumin seeds. Let them sizzle for a few seconds.
Now add chopped onions and saute them until golden.
When they are golden, add tomato puree to them.
Season spices: turmeric powder, coriander powder, salt, and green chillies.
Mix all of them well and saute for a minute.
When the masala is ready, add soaked black chickpeas to it.
Pour 2.5 cups of water and mix all the ingredients well.
Now cover the cooker lid and cook on high heat for 10 to 12 whistles.
After that, turn off the flame and wait for the pressure to drop.
Now open the lid, and the black chickpeas are cooked.
Add some garam masala and coriander leaves.
Mix them well, and the kala chana curry is ready.
Serve it with rice, roti, and poori.