The Chinese custom of eating moon cake was first recorded in the reign of the emperor Hsi Tzung (A.D. 874-889) of the Tang dynasty and became popular in the Sung dynasty (A.D. 960-1279) The moon cake is traditionally made in the shape of a full moon, symbolizing union and perfection, is usually about the size of a doughnut, and is stuffed with a variety of fillings such as bean paste, egg yolk, lotus seeds, dates, pineapple, walnuts, almonds, and sesame. The crafty Chu Yuan-chang, founder of the Ming dynasty, instigated a rebellion against the Mongol rulers by concealing a call to revolt in moon cakes, leading to the downfall of the Yuan dynasty.
There are many styles of Mooncake in China; the most popular in Taiwan are the Cantonese, Soochow, and Taiwanese styles. The Cantonese moon cake is thicker and heavier, while the Soochow and Taiwanese ones have a crispy skin. In the last couple of years a new breed of refrigerated, unbaked moon cake has been gaining popularity, especially among youngster; and durian, coconut meat, vanilla, tea, and coffer have added as ingredients.
Most Chinese consume moon cakes given to them by relatives, friend, employers, or public relations people.Hence, brands matter. Among the most famous are Kee Wah, Maria's and shin Tung Yang. Moon cakes go best with oolong or jasmine tea.
It takes the moon about 29 1/2 days to revolve around the earth, and the Chinese lunar month is either 29 or 30 days. An extra month(called a leap month) is necessary about every three years. There will be a second eight lunar month in 1995. The 15th of the first eight lunar month is celebrated as the Mid autumn festival, which has been designed a public holiday by the Republic of China government. Have a nice holiday, and remember moon calkes taste best when shared by family members or lovers, or both.
Source : http://www.sinica.edu.tw/tit/festivals/0995_MidAutumn.html