What is the primary spirit used in a traditional Old Fashioned cocktail?

The Old Fashioned cocktail is a classic drink that primarily utilizes whiskey as its base spirit. Traditionally, bourbon or rye whiskey is employed, which contributes to the cocktail's depth of flavor and character. Whiskey's natural sweetness, along with its complex profiles of caramel, spice, and wood derived from the aging process, complements the cocktail's other ingredients, such as sugar and bitters.

The drink is typically garnished with a twist of citrus peel, which enhances its aroma and adds a refreshing note, further highlighting the whiskey's qualities. The simplicity of the Old Fashioned allows the whiskey to shine through, making it the cornerstone of this beloved cocktail.

The other spirits listed, while popular in various cocktails, do not form the foundation of an Old Fashioned. Rum, tequila, and vodka each have their own distinct flavor profiles and cultural associations that do not align with the traditional recipe for this iconic cocktail.