Mooncake (Banh Trung Thu) is a name used only in Vietnam for the baked cake with the sweet filling often served during the Mid-Autumn Festival. Mooncakes are usually round (about 10 cm in diameter) or square (about 7–8 cm in length), and about 4–5 cm in height. There are also larger, even giant-sized mooncakes. In addition, mooncakes also have many other designs but more common are shapes of mother pigs with piglets or carp, etc.
Mooncakes are originated from China and spread widely around the world, including Vietnam. Although this cake is not from Vietnam, but for a long time, the mooncakes have become traditional dishes during the annual Mid-Autumn Festival in the country. The round shape like a bright moon expresses the union of family members after many days of separation.