The Old Pal Cocktail first appears in "ABC of Mixing Cocktails" by Harry MacElhone of the famed Harry's New York Bar in Paris. Originally calling for Canadian whisky, an American rye provides a robust flavor profile that adds a great foundation for the dry vermouth and Campari. Next time you are at your favorite bar, cozy up to the Old Pal Cocktail.
Garnish: Lemon twist
Stir with ice.
Strain into a cocktail glass.
Source: "ABC of Mixing Drinks" by Harry McElhone (~1920)