Which ingredient is NOT found in a traditional Manhattan?

A traditional Manhattan cocktail is primarily composed of whiskey, which is typically rye or bourbon, along with sweet vermouth and a dash of bitters. The drink is traditionally garnished with a cherry.

Dry vermouth is not used in a Manhattan; instead, sweet vermouth is integral to the cocktail's signature taste. Sweet vermouth adds a rich, sweet flavor that balances the strong notes of whiskey. Therefore, the inclusion of dry vermouth would change the character of the cocktail to something akin to a Perfect Manhattan, which uses both sweet and dry vermouths.

Understanding the components of classic cocktails is essential for a bartender, as the right ingredients ensure authenticity in flavor and presentation.