Watermelon Lime Cooler

4 cup diced watermelon, plus extra, to serve

1 1/3 cup ginger ale

2 limes

crushed ice

2 mint sprigs, plus extra, to serve

1/4 cup caster sugar

frozen melon balls, to serve (optional)

 

Freeze the watermelon in a freezer bag for six hours or overnight. Purée the frozen watermelon in a food processor or blender. Add the ginger ale, lime juice to taste, ice and a couple of sprigs of mint. Place the caster sugar in a saucer. Rub the rims of the glasses with a cut lime then dip in the caster sugar to frost the rim. Place a few melon balls in each glass, if using, and fill glasses with the cooler. Decorate with slices of lime, watermelon and mint sprigs.