In a big vessel or in pressure cooker add mutton, chilly powder, turmaric powder, salt, half of ginger, chopped tomato and yogurt. Add half glass water if needed
Cover it and let it cook at medium flame untill mutton gets soft
if using cooker let it cool for 20 - 25 mins
Now add oil and fry it untill all water is dries
Now add remaining ginger, green chillies chopped, garam masala and coriander cover it for 5 mins