What is a common garnish in many cocktails?

A common garnish in many cocktails is a slice of fruit or an herb. This option is widely used because it enhances the visual appeal of the drink, adds flavor, and can complement the cocktail's ingredients. For instance, a slice of lemon or lime can provide a zesty aroma and flavor that pairs well with spirits like gin or tequila. Herbs such as mint are frequently used in cocktails like mojitos, where they not only add a refreshing taste but also contribute to the drink's overall presentation.

The other choices may have their specific uses or situations where they are appropriate, but they are not as universally recognized or standard as garnishes in mixology. For example, a decorative straw may serve a functional purpose, but it does not enhance the drink's flavor. Colorful umbrellas, while iconic in some tropical drinks, are often seen as kitschy and are not common in classic cocktail presentations. A rim of salt or sugar does serve to enhance flavor, but it is typically a preparation technique rather than a garnish accompanied by a drink. Thus, the slice of fruit or herb remains the most versatile and widely accepted garnish in cocktail culture.