1 teaspoon basil simple syrup
2 ounces gin (Hendrick's Gin)
1/2 ounce elderflower liqueur
2 to 3 ounces grapefruit soda
In a cocktail shaker, squeeze the lime juice and drop the lime in. Add simple syrup, cucumber slices, basil, and mint, then muddle well.
Add gin, elderflower liqueur, and grapefruit soda and fill the shaker with ice.
Shake and pour everything into an old-fashioned glass. Serve and enjoy!