This St. Germain Kumquat Cocktail is a light, bright gin-based cocktail that combines sweet and tart kumquats with floral notes from the elderflower liquor.
Muddle simple syrup and kumquats together in the base of a cocktail shaker, until the mixture is syrupy. Add half a cup of ice, gin, and St. Germain. Shake well.
Pour into a glass. Top with a bit more fresh ice and about 3 oz. of club soda.
Serve immediately.