1kg piece seedless watermelon, chilled
½ cup orange-flavoured liqueur
1 tablespoon grenadine
2 teaspoons lime juice
4 cups crushed ice
Small watermelon wedges, to serve
Cut rind from watermelon and discard. Chop watermelon into pieces. You need 600g (about 4 cups). Place in a blender. Blend until pureed. Strain through a sieve into a large jug to give 2 cups watermelon juice. Discard pulp.
Add liqueur, grenadine and lime juice to watermelon puree. Stir well.
Just before serving, place 1 cup crushed ice in each glass (1 cup-capacity) Divide watermelon mixture over the ice. Decorate with small wedges of watermelon.