Which spirit is used to make a classic Old Fashioned?

The classic Old Fashioned cocktail is traditionally made using bourbon or rye whiskey. This foundational spirit contributes to the cocktail's distinctive flavor profile, characterized by the rich and complex notes that whiskey provides. Bourbon, which is sweeter and has hints of vanilla and caramel, lends a smoothness to the drink, while rye whiskey, known for its spicier and more robust flavors, can add a different dimension of depth.

The Old Fashioned is typically composed of a sugar cube, Angostura bitters, a splash of water, and the whiskey. The preparation method involves muddling the sugar and bitters together before adding the whiskey, which is often garnished with an orange twist or a cherry. Whichever whiskey is chosen, it remains integral to the drink's identity.

Using other spirits like vodka, rum, or tequila does not align with the classic definition of an Old Fashioned, as each of these spirits significantly alters the flavor, moving away from what makes an Old Fashioned unique. The emphasis on bourbon or rye is crucial in maintaining the cocktail's traditional qualities and taste experience.