Fill 4 glasses with ice cubes.

In a cocktail shaker, muddle together cucumber, lime and mint. Add gin and shake well to combine.

Divide muddled mixture between ice-filled glasses. Top each with 2 ounces of elderflower tonic, 2 dashes of orange bitters and stir to combine.

For nonalcoholic variation, omit gin and bitters and add 1 ounce of seltzer to each glass instead. Enjoy!