What type of bitters is typically used in an Old Fashioned?

The Old Fashioned cocktail traditionally uses Angostura bitters, which is a key ingredient that adds depth and complexity to the drink. Angostura bitters are aromatic and have a blend of herbs and spices, which enhances the flavor of the bourbon or rye whiskey while balancing the sweetness from the sugar. This particular type of bitters is well-known and has been a staple in cocktail recipes for many years.

While orange bitters can complement some cocktails and enhance citrus notes, they're not the primary choice for an Old Fashioned. Peach bitters and Campari, while interesting additions in other contexts, do not align with the classic flavor profile that defines an Old Fashioned. The combination of Angostura bitters with whiskey and a hint of sugar creates the signature taste that is recognized in this timeless drink.