Bata Macher Jhal, also known as Labeo Bata in Mustard Gravy, is a popular Bengali fish curry made with Labeo Bata fish cooked in a spicy mustard gravy. The fish is marinated with turmeric and salt, then fried until golden brown. The mustard gravy is made with a paste of mustard seeds, green chilies, and spices, giving the dish a tangy and flavorful taste. Bata Macher Jhal is typically served with steamed rice and is a delicious and satisfying meal for fish lovers.