Prune juice was an Earth beverage, made from the juice of prunes, a variety of plum. It is noted for being rich in fiber.

Admiral Luther Whitetree offered prune juice to Klingon Captain Krenn while visiting the Federation, though he quickly thought better of it, noting that the Medical Corps would object. (TOS novel: The Final Reflection)

Guinan introduced Worf to prune juice in 2366. He pronounced it "a warrior's drink," and it thereafter became a favorite drink of his, on both the USS Enterprise and Deep Space 9. (TNG episode: "Yesterday's Enterprise" DS9 episode: "The Way of the Warrior", et. al.)

Jadzia Dax began to drink prune juice based on Worf's recommendation. Dax disliked it at first, but thought she might come to like it. (DS9 novel: The Heart of the Warrior)

By 2380, prune juice had become the largest export from Earth to the Klingon Empire. (TNG novel: Q & A)


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