Once the tomatoes turn soft, add turmeric powder and coriander powder. Switch off the burner and let the masala cool down. Grind the masala coarsely.
Put the masala into a kadai and switch on the flame. Now add the water from rajma. I normally add more water while pressure cooking the rajma. Let the gravy thicken, now add the rajma and cook for another 2-3 minutes. Sprinkle roasted cumin powder. Add amchur powder and kasuri methi.
Taste and season if needed. You can add more water depending on the consistency you like.
Break down some of the kidney beans to thicken the gravy.
Add the chopped cilantro leaves (dhanya). Add butter on top. Serve hot with rotis/rice.