Wendan, also known as pomelo, is a citrus fruit. It originated in China and is a specialty of southern China. Wendan is known as the "queen" of pomelo because it is one of the sweetest varieties of citrus fruit. Its flesh is soft and juicy, its flavor is sweet and delicious, and it is loved by people for its taste and nutritional value. At the same time, Wendan is also an important Chinese herbal medicine, with a wide range of effects, such as improving appetite, enhancing digestion, and also regulating the function of the nervous system, with heat detoxification, lowering blood pressure, antioxidant and other effects.

Wendan has a very special status in Chinese culture, and it is worth mentioning that it plays an important role in the traditional Chinese Lunar New Year customs. Wendan is used to do all kinds of rituals, such as sending off officials, returning officials, promoting officials, and so on. In many places in southern China, people would give Wendan to their elders, relatives and friends to show their respect and blessings during the Chinese New Year. In addition, Wendan is also used as a pattern or symbol for New Year's paintings, for example, New Year's paintings with Wendan as the theme are very popular.

Besides China, Buntan is also widely planted in many parts of the world, such as Thailand, Vietnam, Japan, and the United States. And, the cultivation of Buntan has influenced people's daily eating habits. Especially in North America, Buntan is gradually replacing oranges as one of the favorite citrus fruits. Whether as a sweet and salty director, squeezed azuki juice, or directly eaten, the azuki's multiple uses and special flavors have been rapidly spread around the world, and it has become one of the fruits that people love more and more.