In a blender, place cleaned mint leaves, coriander leaves, chili, ginger, hagger, roasted jeera, coriander seeds powder, pepper powder, kala namak and chaat masala, with little water.
Filter it through a metal strainer.
Adjust water to 2 cups.Freeze for 8 hours.
Once frozen, break with a fork by poking and grind it in blender until smooth.
Again freeze. Repeat the process one more time. That is, break the frozen mixture and grind again.This time you will notice the mixture is really smooth and soft in texture.
Freeze couple of hours again before serving.