What fruit is traditionally used to garnish a gin and tonic?

The traditional garnish for a gin and tonic is lime. This choice complements the flavor profile of both the gin and the tonic water. Lime adds a refreshing acidity that balances the aromatic botanicals found in gin while enhancing the overall experience of the drink. The zesty, tangy notes of lime not only elevate the taste but also contribute to the drink's appearance, making it visually appealing.

While other fruits like lemon, cherry, and orange can certainly be used in cocktails, they are not traditionally associated with a gin and tonic. Lemon is sometimes used but is less common, and cherry and orange may lend their flavors to different cocktails altogether. Thus, lime remains the classic and most accepted garnish for this drink.