This thin-fleshed black fruit with a purplish-blue waxy bloom resembles a plum and has a highly astringent flavor if eaten raw. It is most often used in different sorts of alcoholic beverages like "mock" port wine, Pacharan, and Bargnolino, although you probably know it best by its inclusion in a certain type of gin liqueur (which bears the name of the fruit). It is also delicious made into jams and pies, and can be preserved in vinegar.
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Answer to Food & Drink Quiz Friday #9: Jeroboam!