Seasonal, fresh ingredients make summer the best time to enjoy this invigorating cocktail.
Strip leaves from two sprigs of mint and place in the bottom of a highball glass along with cucumber.
Muddle with a muddling stick or the handle of a wooden spoon. Fill a glass with ice.
Pour gin over ice, top off glass with tonic, stirring once, and garnish with remaining mint sprig and thin cucumber wedge.