Mutton Vindaloo

Cooked this last Sunday. Basically an easy one and tastes rather good. I cooked arond 750 grams of mutton. Other ingredients:
Haldi /  turmeric Powder: 1 tsp
Zeera /Cumin , Dhania /Coriander, Poppy seeds, Mustard Seeds : 2 tsp each these are to be slightly roasted and ground to powder. One may use powdered packets too.
 Cloves: 4,Green Cardamom  : 4( To be powdered). One may use powdered garam masala too.
Onions: 3-4 medium
Garlic: 5-6  flakes
Ginger: 2 inch
Oil: ( I used mustard) : 3 tbs
Salt: to taste
Vinegar: 1 tbs
All The powdered spices including the powdered Cloves and cardamom are mixed along with the vinegar . Marinade the mutton using a little of this spice mixture and keep aside for a couple of hours. Keep the remaining part aside.
Grind the onion ginger and garlic to paste. The ginger may be julienned if you so like.
Heat oil in a pan. Fry the onion garlic ginger paste for sometime. Use the remaining amount of spices and fry till oil separates. Now add the marinated mutton. Cook for sometime.Add a little warm water if you want. then transfer to a pressure cooker and let it cook till tender. This may be served with steamed rice or chapatis.