Boil meat in pressure cooker put 4 cups water, few blackpeppers, cloves, cinnamon and cardamons. Till almost done.
In a pot put 6 tbsp oil which you fried birista with keep on flame and add whole garam masala let it splutter add tomatoes and cook on medium flame till it's soft and paste formed, add all spices, ginger garlic and yogurt, mix well add potatoes and cook on low or medium flame.