In wok, add cooking oil, whole gram masala/ round red chili and fry for 1-2 minutes.
Add onion and fry until translucent.
Add mutton mince, ginger garlic paste and cook until mince changes color.
Add tomatoes and cook until it dissolves.
Add yogurt, cover and cook for 15 minutes medium flame.
Add potatoes, cover and cook for 10 minutes.
Add 2 cups water to make gravy and cook for 10 minutes.
Add green chilies and coriander.
Serve 12-15 persons.