The Rosemary Maple Sour brings a sweet sprig of innovation to a
cocktail classic. The earliest printed Whisky Sour recipe appears in the
1862 book “The Bartender’s Guide” by Jerry Thomas. But versions of this
cocktail were widely popular long before that. An English naval officer
named Edward “Old Grog” Vernon, who died in 1757, was known to mix a
variation of the sour for his crew on long sea journeys. This was for
practical reasons. The citrus fought scurvy, and alcohol, usually rum,
was safer to drink than water in many instances. Eventually, the drink
would be brought to shore and refined with ingredients like those found
in this bourbon cocktail – particularly Maker’s Mark.