Which drink is garnished with a flag?

A drink that is garnished with a flag typically refers to a garnish consisting of a small piece of orange and a cherry, resembling a flag. The Red Death cocktail often uses this garnish, making it the correct choice. This colorful presentation adds visual appeal to the drink and can enhance the overall drinking experience.

In contrast, the other drinks listed do not traditionally use this specific garnish. For instance, a Tom Collins is commonly garnished with just a lemon slice or a cherry, while a Long Island Iced Tea typically has a lemon wedge. A Vodka Gimlet is usually served without any garnish or may simply feature a lime wheel. Thus, the distinctive flag garnish is specifically associated with the Red Death, which is why it is the correct answer in this context.