1 large sprig mint
½ oz/15 ml simple syrup
Half a spent lime hull, and
¾ oz/22.5 ml of lime juice
1½ oz/45 ml white rum
1½ oz/45 ml chilled club soda or sparkling mineral water
In a 16 ounce glass, gently muddle together the mint and the simple syrup
Add the rest of the ingredients
Top with crushed ice and mix with a straw until drink is combined and glass is frosty.