Rinse and soak the black chickpeas overnight or 8 hours.
Boil the black chickpeas with 4 cups of water in Instant pot .Boil them for 20 minutes or till they are cooked but not mushy.
After the steam comes naturally ,remove it in a bowl and keep them aside.
Take a Pan /Wok .Add oil to it. When its hot add bay leaf ,dry red chilli and cumin seeds to it .
Add chopped onion to it .Saute it for 2-3 minutes on low /medium flame till onion looks light brown.
Add ginger garlic paste to it .Saute it till it looks mixed with onion and raw smell is gone.It will take around 1 minute.
Add turmeric powder ,coriander ,cumin powder ,red chilli , powder ,Dry mango powder and chopped green chilli to it .
Stir it on low medium flame till all the spices looks cooked.
Add chopped tomato to it .Mix it with all the other spices and cook for 3-4 minute .If you think your spice mix is burning or sticking to the pan ,add 2 tbsp of water to it .Stir it .At this time add 1 tsp of oil to it .
When its cooked in next 5-6 minute. It will release the oil.
Mix boiled chickpeas at this time .Add garam masala to it.
Now add water to it .i have kept it little dry but you can add 2 cups of water for curry consistency.
Let it cook for 4-5 minute or till it reaches the consistency of your liking.
Taste the seasoning ,if you have to adjust ,adjust it now.
Garnish with green chillis ,cilantro leaves and lemon wedges.
Serve .