Add the marinated mutton pieces, mix well and saute for 2 to 3 minutes. Cook covered on a low flame till the mutton turns soft and tender or cook for 3 whistles in a pressure cooker. Switch off the stove. If cooking in the pan without pressure cooker, stir occasionally to prevent burning. Remember the flame has to be very low otherwise mutton may turn hard. When the pressure goes off, remove the lid. You will be left with a thick gravy. How thick depends on your mutton. If you are left with lot of watery gravy, then evaporate it by cooking for some time.