Step 1

In the bottom of a highball glass, muddle the mint leaves with the sugar and lime juice to release the oils from the mint leaves.

Step 2

Next add a splash of soda water and fill up the glass with crushed ice.

Step 3

Add the rum, top up with the soda water and give it a stir.

Step 4

Garnish with a sprig of mint and a slice of lime and serve.