Boil the potatoes , peel and mash them .
Blanch all the vegetables and process them together coarsely in a blender place in a piece of muslin cloth and squeeze gently to remove excess water.
Mix the potatoes and veggies .
Add the green chilies, ginger, roasted gram powder, roasted cumin powder, cardamom powder, chaat masala and salt.
Mix well , check for seasoning .
Pinch out small balls from the mixture and shape into patties.
Shallow fry or deep fry or roast them over charcoal.
Serve with mint chutney, onions and lemon slices.