Wash and soak chana into warm water for 6-8 hours. Then cook in pressure cooker with enough water. Then strain water from it. In a mixing bowl take boiled Kabuli chana. Slightly mash them with masher. Add boiled and mashed potatoes, chopped onion, tomato, capsicum, coriander leaves, salt, red chilli powder, roasted cumin seeds powder, black pepper powder, crushed green chillies and garlic. Combine well.