A Whisky Sour cocktail is a bourbon-based mixed drink that is often referred to as a Boston Sour. According to Brian Petro of The Alcohol Professor, the cocktail dates back as far as the late 1790s, when Vice Admiral Edward Vernon of England began mixing a few ingredients together to serve his crew. Battling scurvy and malnutrition, Vernon apparently wanted a drink that not only combatted sea-sickness but would not heavily intoxicate sailors. His answer was to water the alcohol down with lemon or lime juice. For the British, it was gin and brandy, but by and large, the Americans loved their bourbon, and thus, the Whisky Sour recipe was born.