600g watermelon flesh, seeded

2 teaspoons lime juice
1/4 cup (60 g) caster sugar
1/4 cup (60 ml) citrus-flavoured vodka
 

Puree the melon and lime juice and sugar in a blender, then pass through a fine sieve.  Stir in the vodka, and taste for sweetness, adding more sugar to your personal taste.  Pour into a shallow 1.5 litre metal time and freeze for an hour or so, until it starts to freeze around the edges.  Mix it up with a fork, and repeat every half hour for 4 hours, until ice crystals have formed throughout.

To serve, beat with a fork then scrape into bowls or shot glasses