Dragon Jiaozi

Common dumpling meat fillings include pork, mutton, beef, chicken, fish, and shrimp which are usually mixed with chopped vegetables. Popular vegetable fillings include cabbage, scallion (spring onions), leek, and garlic chives. Dumplings are eaten with a soy sauce-based dipping sauce that may include vinegar, garlic, ginger, rice wine, hot sauce, and sesame oil.
Jiaozi's origin and development
Jiaozi are one of the major foods eaten during the Chinese New Year and year round in the northern provinces. They look like the golden ingots yuan bao used during the Ming Dynasty for money and the name sounds like the word for the earliest paper money, so serving them is believed to bring prosperity. Many families eat these at midnight on Chinese New Year's Eve. Some cooks will even hide a clean coin for the lucky to find.
Jiaozi were so named because they were horn shaped. The Chinese for "horn" is jiǎo (角), and jiaozi was originally written with the Chinese character for "horn", but later it was replaced by a specific character 餃, which has the food radical on the left and the phonetic component jiāo (交) on the right.