In a heavy bottom pan add some oil and when oil is hot add garam masala.when its spluters add cumin seeds add chop onions for this preparation.we wont have to brown the onions and add turmeric and ginger garlic paste and once the ginger garlic paste is cooked.add nicely clean cubes of lamb or mutton and add little water to it and cook till meat is tender.make sure your lamb is fully cooked as we are not going to cook this lamb in a gravy or anything. take some garlic and little bit of cumin seeds and peppecorns after that grind it.next melt the butter and mix in the grind powders,after 5 seconds add green chili and curry leaves .add red chili powder 1/2tsp,cumin powder 1/2 tsp,and coriander powder 1/2 tsp.after adding these to with the lamb.for that we use the bigger pan for evaporate the moisture.add the chopped coriander to garnish and add little lime juice to it.