Watermelon, vodka and herb granita

Method

1. Put the watermelon and raspberries in a food processor and whizz to a purée, or liquidise in a blender until smooth. Use the back of a spoon to push the fruit purée through a fine sieve into a bowl. Discard any solids left in the sieve.
2. Mix the vodka, sugar, lemon and lime juice until the sugar has dissolved, then add to the watermelon/raspberry mixture. Pour into 2 or more plastic, lidded containers that fit easily in your freezer and freeze for 2-3 hours. You don’t want the depth of the liquid to be more than 2-3 cm. Break up the crystals with a fork (you need to do this before the mix freezes too hard). Freeze until ready to eat. Serve in bowls, topped with small mint and basil leaves.