Ilish Bhapa is a traditional Bengali dish made with Hilsa fish, steamed in a flavorful mustard and coconut paste. This recipe takes a twist by cooking it in the oven, resulting in a delicious and aromatic dish. The fish is marinated in a mixture of mustard paste, coconut milk, green chilies, and spices, then wrapped in banana leaves and baked to perfection. The result is a tender and flavorful fish with a rich and creamy sauce.