It is freezing in winter, everything is dormant, cold evil attacks people, the physiological function of human body declines, and the yang gradually declines. Chinese medicine believes: "In the cold winter, everything is alive and hidden, and the physiological activities of the human body are in a state of inhibition. The way to keep healthy is to keep out the cold, so black tea is the top grade in winter. Black tea is sweet and warm, which can nourish human yang; Black tea is rich in protein and sugar, which can warm the abdomen by heating, enhance the cold resistance of human body, and help digestion and greasy. Black tea is also called fully fermented tea because it is fully fermented during processing and oxidizes tea tannins. Fresh tea leaves are oxidized to form red oxidative polymerization products-theaflavins, thearubigins and theabrownins. Some of these pigments are dissolved in water and brewed into black tea soup. Famous traditional Kung Fu black tea products include Hong Hu, Hongyi, Ninghong, Hong Min, Taihong, Qi Hong, etc. It is famous for Qi Hong in Qimen County, Anhui Province. When brewing black tea, it is advisable to brew it with freshly boiled water and cover the cup to avoid fragrance. British people generally have the habit of drinking "afternoon tea". They often mix Qi Hong and Indian black tea, and then add milk and sugar to drink. In some parts of China, there is also the habit of drinking black tea with sugar, milk and sesame seeds, which can not only warm the abdomen, but also increase nutrition and keep fit. Finally, I recommend a very good Qimen black tea: