Rub little salt into fish and set it aside for 10 minutes. Heat 2 tablespoons of oil in a pan and fry the fish until light brown. Remove from the oil and set it aside. Heat 3 tablespoons of oil in a pan and ad the peppercorns, cloves, cinnamon & cardamoms and fry for few seconds. Then add the ginger-garlic paste and the onions and fry until the onions are golden. Add red chili powder & salt and mix well. Now add the beaten yogurt and cook until the gravy becomes thick. Then put the nutmeg with fried fish and cover the pan. Cook over low heat until the fish is soft. Garnish with cilantro leaves. Serve hot.