When it gets hot, have a glass of iced plum juice as it is the best way to quench your thirst. Granny's Plum Juice uses dried plums and they are marinated for three months. After spice, perilla, rosella tea, and 17 other herbs are added, it is then brewed in a clay pot over a small fire and finally turns into a sweet and sour drink. The drink not only stimulates the appetite but is also good for the skin. It is healthier than most bottled drinks on the market.