Hilsa with Tamarind and Mustard is a classic Bengali fish curry made with hilsa fish, tamarind pulp, and mustard paste. It is a flavorful and tangy dish that is popular in Bengali cuisine. The fish is marinated with turmeric and salt, then cooked in a gravy made from mustard paste, tamarind pulp, and spices. It is best enjoyed with steamed rice for a traditional Bengali meal.