Mutton chops in Garam masala

1 kg. mutton chops, trimmed, 7 onions chopped, 4 tomaotes chopped, 4 potatoes peeled cut into 2 pieces, 2 cup curd, 1 1/2  tbsp. chillli powder, 1 tsp aniseeds, 1 tsp poppy seeds, 1 tsp coriander seeds, 1 tsp cumin seeds, 1 tsp garlic paste, 1 ginger paste, 1 tsp green chilli paste, 8 cardamoms , 8 cloves, 9 peppercorn 2tbsp coriander leaves  finely chopped, 1/4  cup oil, salt to taste, 1 tbsp sugar, 1 tbsp garam masala powder, 1 tsp turmeric powder,
Add curd, ginger, garlic chilli paste, red chilli powder, turmeric powder, and garam masala powder, salt and sugar to chops and reserve for half an hour.
Heat  2 tbsp oil. Add all spices cardamoms, cloves, peppercorns, cummin seeds, coriander seeds, poppy seeds,and aniseeds brown, Add onions  brown than add tomatoes stir well. cool and  liquidise. Heat remaining oil   in a pressure cooker.Add  chops  and fry till oil separates from spices. Add ground  onion mixture, potatoes salt and one cup hot water. pressure cook for 20 minutes. When done garnish with coriander leaves.