Which of the following ingredients is NOT included in the Zombie cocktail?

The Zombie cocktail is a well-known tropical drink that typically includes a combination of rum, fruit juices, and various other ingredients that contribute to its fruity and potent profile. Common ingredients are various types of rum, lime juice, pineapple juice, apricot brandy, and sometimes grenadine or bitters.

Vermouth, which is included in many classic cocktails such as martinis and Manhattans, does not feature in the traditional recipe for a Zombie. The focus of the Zombie is mainly on rum and fruity flavors, which is why it typically omits vermouth entirely. This ingredient does not align with the cocktail's profile or flavor profile, making it the correct choice in identifying the ingredient that is not included in the Zombie cocktail.