SUPPAI means sour. Tsuru-ume SUPPAI is based on umeshu a sake. Wakayama Prefecture is the plum heartland of Japan. This concoction uses three times more plums than a typical umeshu. The specific plum used here is called Nankobai. Its skin is soft, and the fruit itself is thick and juicy; one of the best quality plums in Japan. The understated sweetness is refreshing, and its acidity is addictive!