Ca Kho To is a traditional Vietnamese dish that is popular in Halong Bay. It is made from catfish fillets that are marinated in a mixture of fish sauce, sugar, and spices, and then braised until the fish is tender and the sauce is thick and caramelized. Ca Kho To is typically served with steamed rice and a side of pickled vegetables. The combination of the sweet and savory sauce and the tender fish creates a delicious and comforting dish. It is a popular home-cooked meal in Halong Bay and is loved by locals and visitors alike.