4 cups peeled, seeded, cubed watermelon
1/2 cup light rum or 2 ounces light rum
1/4 cup fresh lime juice
1/4 cup orange-flavored liqueur
ice cubes
Freeze watermelon in a shallow pan at least 6 hours. Combine frozen watermelon, rum, lime juice, and orange-flavored liqueur of an electric blender; process until smooth, stopping once to scrape down sides. Add enough ice to bring mixture to 5-cup level; process until smooth. Repeat procedure, if necessary, until mixture measures 5 cups.
Makes 5 cups.