1. In a pressure cooker, heat oil and saute the onions until they turn brown.
2. Add lamb chops, ginger garlic paste, mint leaves, black pepper powder and chopped green chillies.
3. Saute well; add water and pressure cook the chops until they are tender.
4. Once the lamb/mutton chops are tender add vinegar, soy sauce (optional) and tomato sauce/ketchup and salt.
5. If required, add some more black pepper powder and some water and cook until a thick gravy is formed.
6. Garnish with potato chips.

Image: Flickr/creativecommons Kirti Poddar