Moon cake is the ubiquitous fare at any celebration of the traditional Mid-Autumn Festival, not only because of its delicious taste and charming looking, but also for the cultural and artistic connotation. It is said that moon cakes were used as a medium by the Ming revolutionaries in their espionage effort to secretly distribute letters in order to overthrow the Mongolian rulers of China in the Yuan Dynasty. The idea was said to be conceived by Zhu Yanzhang and his advisor Liu Bowen, who circulated a rumor that a deadly plague was spreading and the only way to prevent it was to eat the special moon cakes. This promoted the quick distribution of the moon cakes, which were used to hide a secret message of coordinating the Han Chinese to revolt on the 15th day of the eighth lunar month. Another legend is hiding the message in the surface of moon cakes as a simple puzzle or mosaic. In order to read the encrypted message, each of the 4 cakes packaged together must be cut into 4 parts each. The 16 pieces of moon cakes must then be pieced together in such a fashion that the secret message could be read. The pieces of moon cakes were then eaten right away to destroy the message.