1. Heat the oil, add the whole spices and onions.
2. When the onion is golden brown, add the ginger and garlic for fry for 2 mins.
3. Then add the tomato puree and fry for a further minute.
4. Add the tomatoes, powders, garam masala, chillies (if using) and salt. Stir.
5. Add the mutton and potatoes. Stir.
6. Add 125 ml. water, cover and simmer on low heat for 40 mins. until the meat is cooked.
7. Keep checking to ensure the sauce is not drying up before the meat is cooked, and add more water if necessary.
8. Garnish with the chopped coriander.

Note: Always wash hands thoroughly after handling chillies.