Marinate the mutton with curd, salt,Red chili,2 tbsp of oil powder(kashmiri)-,Turmeric powder,Cumin powder,Coriander powder and vinegar for 2-3 hours.
Soak poppy seeds,cashew,melon seeds in water for 1 hours.
Take a pan and brown the sliced onion and make a fine paste with ginger,garlic,poppy seeds,cashew,melon seeds,tomato.
Now take a pan and heat 4 tbsp oil. Now sauté chopped onion till it gets golden brown and add the masala paste cook it till the raw flavor gone add 1/2 cup of water cook it till it releases oil. Then, add the marinated mutton into it and cook it for another 20-30 minutes without any water,adjust salt n sugar. Stir it occasionally.Now cook it on a medium flame till the mutton gets tender. Garnish with fresh coriander leaves.Serve hot with indian breads.