The British Navy played a significant role in the evolution of the Sour, as the sailors often mixed their rum rations with lime juice to help combat scurvy and malnutrition during long voyages at sea. This mixture, known as Grog, became a staple of British naval life and helped to popularize the use of citrus juices in cocktails.

The popularity of Grog and other rum-based drinks among sailors eventually spread to the shores of England, where Punch Houses began to spring up in the 1600s. These establishments served a variety of rum-based punches and grogs, which often included citrus juices and other ingredients to balance out the strong flavors of the rum.

The Sour is a direct descendant of the Punch and evolved over time to include a variety of other ingredients, such as egg whites and bitters, which added new dimensions of flavor and complexity to the drink.

One of the most appealing aspects of the Sour is its versatility. The drink can be made with a variety of spirits, including whiskey, gin, and tequila, each of which imparts its own unique flavor profile to the drink. Additionally, bartenders may choose to experiment with different types of citrus, such as lemon, lime, or grapefruit, to create a truly custom cocktail.