then soak the soya chunks into the hot water for 30 minutes. drain the water and in a large bowl squeeze off excess water from the chunks properly crumble the soya chunks with your hand or alternatively blend the soaked soya chunks to coarse paste. mash the potatoes well with your hand. now add chopped onion, ginger, coriander leaves and green chilli. also add spices like cumin seeds, red chilli powder, garam masala, coriander powder, chaat masala, aamchur powder and salt.