Heat oil in a saucepan, add beef pieces and fry for a while. Add ginger garlic paste, tomatoes, salt, black pepper, add yoghurt roast till gravy forms. Now add water and cook till tender. Add green chilies, green onion and coriander. When onion soften and oil comes on the surface serve, serve garnished with coriander, mint ginger, green, chilies and lemon slices.