You will need an Instant Pot
Drain the water from the soaked black chickpeas, rinse and keep it aside.
Turn on SAUTE (more). When the pot displays “HOT”, add oil. Add cumin seeds, bay leaf, whole green cardamom, and chopped onions. Sauté for 3-5 minutes, or the onions are translucent.
Add chopped garlic, and sauté for 30 seconds.
Add chopped tomato, ginger, and green chili. Dry spices – coriander powder, red chili powder, turmeric powder, dried mango powder. Sauté for 3-5 minutes, or the tomatoes are soft.
Note: Add garam masala after pressure cooking the beans.
Add beans, baking soda, water, and salt to taste. Close the lid with a vent in sealing position.
Turn on PRESSURE COOK (high) for 30 minutes. Let pressure release naturally, around 10 minutes. Release the remaining pressure manually.
Open the Instant pot, and check if the beans are soft and cooked. If required, add a few minutes of pressure cooking.
Turn on SAUTE (more), and add garam masala, and lemon juice.
Note: Simmer for a few minutes or to the desired thickness. The sauce thickens as it cools.
Garnish with some fresh coriander. Serve hot with steamed rice, roti, or paratha.