What dashes are commonly used in an Apple Jack cocktail for flavor enhancement?

In an Apple Jack cocktail, Angostura bitters are commonly used to enhance the flavor. Angostura bitters bring a complex blend of herbal and spiced notes that can deepen the cocktail's overall profile. They help balance the sweetness of the apple brandy typically used in an Apple Jack, providing a subtle bitterness that rounds out the flavors and adds depth.

While other bitters like peach, fennel, and orange have their unique profiles and may complement various other cocktails, they are not traditionally associated with the Apple Jack. Angostura bitters, with their historical significance and versatility, are the standard choice for this drink, making them the most appropriate option for flavor enhancement in this context.