In a blender, add onion, ginger, coriander seeds, jeera, green cardamom, red chillies, and cloves, then grind to a smooth paste. Keep aside.
1.5 big onions, 2-3 inches ginger, 8-9 red chillies, 2 tsp coriander seeds, 2 tsp cumin / jeera seeds, 4 green cardamom, 2 cloves