Is it tea or something? My mother soaks every summer, but only for a day or two. Because of the high temperature, it won't last long This is just black tea. The leaves of mangrove trees are red. This is a fruit much smaller than an apple. Because this kind of tea is cheap, the cost is only one or two yuan a bag, so many small restaurants use it to make tea in summer. Because it is cheap, in ancient times, poor families would drink black tea to relieve the heat when they came back from working outside.