Sprinkle the salmon with lemon juice, turmeric & salt and let it marinate for 15 minutes.
Heat oil in a pan and fry the ginger, garlic and onion until the onions are golden. Add the poppy seeds & crushed pepper and stir for a minute. Then add the tomatoes & all the spice powders and little salt to taste. Mix well. Now add the marinated fish with the lemon juice and mix gently. Cover and cook over low heat for 15-20 minutes or until the fish are cooked. Garnish with chopped cilantro leaves and serve hot.