Place all ingredients for the onion masala into the inner liner of the Instant Pot.
Place a trivet on top of this masala.
In a heat-safe bowl, place the red kidney beans and 2 cups of water. Cover the bowl with foil.
Place the covered bowl on top of the trivet. Seal the Instant Pot.
Press the BEAN button to cook for 30 minutes and let it naturally release pressure for 10 minutes.
Open the Instant Pot and remove the red kidney beans and the trivet. Slightly mash about half the rajma with the back of your spoon.
Turn the pot onto SAUTÉ (high). Pour the rajma and any remaining water in with the onion masala and mix well. Let the contents come to a boil to meld all the flavors well.
Serve with rice.
Tips And Tricks For Making This Red Kidney Beans Recipe
Want to make this Pressure Cooker Rajma Recipe with canned kidney beans? First, make the onion masala. Then add 3/4 cup masala, 4 cups cooked kidney beans, and 1 cup water to the Instant Pot. Cook for 5 minutes under pressure, NPR for 10 minutes then release all the remaining pressure and serve.