Eight-treasure tea, also known as "three batteries", takes tea as the main raw material, with rock sugar, medlar, red dates, walnuts, longan, sesame seeds, raisins, apple slices and so on. It tastes sweet and delicious, and has the effects of nourishing yin, moistening lung, clearing throat and benefiting throat. Eight-treasure tea needs to be brewed with boiling water, so that each ingredient can release its taste.