What is the garnish for a Gibson cocktail?

The garnish for a Gibson cocktail is an onion. This cocktail is a variation of a martini that typically includes gin and dry vermouth, and the characteristic garnish of a pickled onion distinguishes it from a traditional martini, which is often garnished with an olive or a lemon twist.

Using an onion enhances the drink's flavor profile by adding a subtle, tangy note that complements the botanicals of the gin. This unique garnish is part of what makes the Gibson special and can also evoke particular tastes and aromas that contribute to the overall drinking experience. The presence of the onion is a defining feature of the cocktail, which is why it is essential for bartenders to remember this garnishing detail when preparing the drink for customers.