Prune Juice is a juice made from dried plums (prunes), known for its deep, rich flavor and natural sweetness. In the context of alcohol and cocktails, prune juice can add a unique, sweet-tart dimension to drinks. It pairs well with spirits like rum, brandy, and whiskey, and can be used in cocktails such as the Prune Old Fashioned or the Prune Brandy Sour. The juice's rich, fruity flavor can complement other ingredients, providing a complex and nuanced taste to both classic and innovative cocktails.