Place the lime wedges and sugar in a serving glass and muddle until the juices have released from limes.
Take 8 mint leaves, clap them in your hands to release the aroma, then run them around the rim of the glass. Place the mint leaves in the glass and muddle gently.
Fill the glass with ice cubes and top with soda water.
Stir the mocktail gently and decorate with 2 mint leaves.