Tea is a spiritual refreshment. Usually, the moon during mid-autumn is the most beautiful and is well paired with tea. According to a Chinese legend, mooncakes were used by the Ming revolutionaries.
It happened during the Yuan Dynasty where it was ruled by the Mongolians from the North. It was said that a Han Chinese rebel leader, Zhu Yuanzhang and his advisor, Liu Bo Wen, planned to arouse the Han Chinese to rise up against the ruling Mongolians and end the Yuan dynasty. However, due to the strict search by government, it was very difficult to pass messages. Liu thought of a strategy. He gained permission to give gifts to his friends in different bases.
These gifts were round moon cakes. Liu ordered his subordinates to hide notes in the cakes with the date of the Han Chinese rebellion (the 15th night of the 8th lunar month). Thus, Liu got word to his people who found the revolutionary message when they cut open the moon cakes. They then set out together to overthrow the Mongolians, thus ending the Yuan dynasty.
Zhu Yuanzhang shared the joy by having celebrations in the upcoming mid-autumn and reward his subjects with the round moon cakes. Since then, eating mooncakes has been a custom of Mid-Autumn Festival.