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Explore LibraryAngostura Aromatic Bitters is a ubiquitous cocktail ingredient that adds depth and complexity to countless drinks, but its exact recipe remains one of the most closely guarded secrets in the spirits world. Interestingly, during World War II, the British Royal Navy considered Angostura Bitters so essential that they classified it as a "priority supply item," ensuring its continued production and distribution even during wartime shortages.