In a bowl combine mutton ,onion ,tomato ,ginger garlic paste , greenchilli ,coriander leaves , salt mix it well n keep it for 1/2 hr ( maximum 2 hr for great taste)
In a pan add oil , redchilli powder ,curry leaves then add mutton mixture 1/2 cup water n cook for 15 mins until cooked .then open the lid check if any water left , if there cook till water dries off
it should look like semi gravy or even can make it dry ..