Not all teas can be kept in thermos bottles. There are two ways to make tea, one is to order tea, and the other is to make tea. What we are used to now is the method of ordering tea, which is introduced in the tea classics. First, the cakes and tea leaves should be ground for later use. Then start boiling water. Put the selected water into the kettle and boil it with charcoal fire. But it can't be boiled completely. Add tea powder. Tea and water are integrated, and foam appears when boiling, which is a small camellia and a cake is a big flower, both of which are the essence of tea. At this time, scoop out the foam cake and put it in a cooked jar for later use. Continue to cook, the tea and water further merge, and the waves roll and surge, which is called three boiling. At this time, the water and tea in the tea will be poured together with the second boiled foam cake, and the amount will be strictly measured according to the number of people. After the tea soup is cooked, it is evenly poured into everyone's bowl, which means both rain and dew and sharing joys and sorrows. This tea ceremony needs heat preservation.