The whiskey sour is a mixed drink containing whiskey (often Bourbon), lemon juice, sugar, and optionally, a dash of egg white. With the egg white, it is sometimes called a Boston Sour. It is shaken and served either straight or over ice.
The traditional garnish is half an orange slice and a maraschino cherry.
A notable variant of the whiskey sour is the Ward 8, which often is based either in Bourbon or rye whiskey, with both lemon and orange juices, and grenadine syrup as the sweetener. The egg white sometimes employed in other whiskey sours is generally not included in this variation.
The oldest historical mention of a whisky sour prepared in the world comes from a newspaper published in Wisconsin in 1870.
In 1962, the Universidad del Cuyo published a story which cited a Peruvian newspaper called El Comercio de Iquique as indicating that Elliott Stubb created the “whisky sour” in 1872. El Comercio de Iquique was published by Modesto Molina between 1874 and 1879.