Wash lamb apply salt and keep it a side for 1 hr. ( Optional raw papaya blend in a blender and add to the lamb to cook fast or tender)
Soak all these in vinegar and coconut milk for 30min red chilli,pepper corns,garlic,ginger,cloves,cinnamon,cumin seeds,mustrad,sugar. Then blend till fine paste.
After one hour take the lamb add all the spice mixture mix well and keep a side for 4 hours.
After 4 hours take a pan add oil, lamb masala cook for 5min then add chopped onions.
Cover the pan with a lid by adding some water and cook in a low flame.cook till the lamb is tender or oil oozes out.