Get them in the mood for fun with this delicious cocktail made of watermelon, the juice of some limes and some rum, a really refreshing summer drink.

Serves 4 as an aperitif
Takes 15 minutes to make, plus chilling and freezing

Ingredients

* 75g granulated sugar
* 1 small watermelon (about 2kg), peeled, chopped and deseeded
* Juice of 4 large limes
* 50ml white rum

Method:

1. Put the sugar in a pan and pour over 150ml water. Heat slowly until the sugar dissolves. Bring to the boil, then reduce to a simmer for 5 minutes. Cool, then chill until needed.

2. Meanwhile, put the melon chunks in a freezer-proof container and freeze for 21/2 hours, until solid.

3. When you're ready to serve the drinks, put the melon in a blender with the chilled sugar syrup, lime juice and rum. Whizz to a thick shake and spoon into 4 x 400ml highball glasses. Serve immediately.