Cut bottle gourd into small pcs and pressure cook for three whistles with very little water. Remove excess water once cooked and smash it. Heat oil in a pan. Add mustard seeds, jeera, Hing, garlic and onion. Add all the masalas and fry for 2 mins then add tomatoes and fry till all gets mixed well. Add salt and smashed bottle gourd to it. Mix all well, cover the and cook for 5 mins. Sprinkle coriander leaves and the yummy bhurta is ready to serve with bajra or jowar roti.