Dongzhi Festival it is an official name. It was common festival in Chinese, Japanese, Koreans and Vietnamese. It is an annual festival. Dongzhi means the arrival of winter. This festival is related to Winter solstice .
The origins of this festival can be traced back to the yin and yang philosophy of balance and harmony in the cosmos.
Traditionally the Festival is also a time for the family to get together. One activity that occurs during these get-togethers is the making and eating of Tangyuan (it madeof glutinous rice flour) or balls (its may be plain or stuffed) of glutinous rice , which symbolize reunion.
Then they cooked in a sweet soup or savory broth with both the ball and the soup/broth with both the ball and the soup/broth served in one bowl. It is also often served with a mildly alcoholic unfiltered rice wine containing whole grains of glutinous rice.
In Northern China people typically eat dumpings on Dongzhi.
Taiwanese people also use the festival food as an offering dish to worship the ancestors. Generally the festive food is also a remember that celebrators are now a year older and should behave better in the coming year.