Plum sake, or Umeshu, is a popular Japanese sweet, fruity liqueur made by macerating (soaking) Japanese ume plums (often called plums, but technically a type of apricot) in sake (or sometimes shochu/other spirits) and sugar, resulting in a rich, sweet, almond-like, and refreshing drink. It's enjoyed chilled, on the rocks, in cocktails, or with hot water, pairing well with desserts, cheeses, and fruit dishes.