Put the four lime wedges into a glass, then add the sugar and muddle (squish everything together) to release the lime juice

Put the mint leaves on one hand and clap. This bruises the leaves and releases the aroma. Rub the mint leaves around the rim of the glass and drop them in. Use a muddler, bar spoon (or even a rolling pin) to gently push the mint down into the lime juice.

Half fill the glass with crushed ice and pour in the Bacardi Carta Blanca. Stir the mix together until the sugar dissolves

Top up with crushed ice, a splash of the soda water and garnish it with a sprig of mint.