Pre-preps for Makhani Gravy: Before you start making your kababs, just do the following. Ina pressure cooker, add tomatoes slit into 4.Ginger garlic, onion slit into 4,capsicum slit into 2 and deseeded ,cashew and 1/4th cup water(to avoid burning. Pressure cook this till one whistle on high flame and the simmer and cook further till two more whistles. Cool this mixture and grind into a fine paste. Sieve it and keep aside.