In a blender put 2 tablespoons of yoghurt, a few cumin seeds, green chillies and some mint leaves followed by half a tea spoon of salt. Blend.
This is what your paste should look like after you blend it
Mix the rest of the yoghurt along with 2 to 3 table spoons of tamarin paste
Mix it all well
Add your chickpeas and potatoes to the yoghurt mixture
Add the chickpeas and potatoes to the yoghurt mixture along with a tea spoon of chaat masala
Add a handful of Boondhi
Garnish it with cabbage, carrot and onions. Chill and serve :)