Heat 1tsp ghee in a pan, add the ingredients for making the paste and sauté for 3-4 minutes. Remove, cool and grind into a paste with little water.
Cook dal, chopeed ridge gourd and potato together in pressure cooker till done.
Heat 1 tsp oil in a pan, add urad dal, cumin & mustard seeds, hing and curry leaves, when the seeds splutter, add the dal mixture, tamarind pulp, salt and the ground paste.
Cook on medium low heat for 10 minutes. Serve with rice and papad.