Tonic water lends drinks a sophisticated foundation of bittersweetness and a lively, effervescent fizz, which makes it pair incredibly well with an herbaceous pour of gin.
Deena Sayers, the beverage director at The Stand in New York, says tonic water's characteristic bitterness makes it a great pairing for gin's bold, citrus-forward flavors.
"It stands up well to gin's complex botanic profile, preventing it from being overly sweet [...] carbonation offers a refreshing lift and subtle sweetness enhances it," she says.
While the pairing tastes best cold, its flavors mesh well even in a hot winter cocktail. Sayers also encourages people to try mixing gin and tonic with other additions.