3/4 cup honey or simple syrup
1 1/2 cups vodka or watermelon vodka
1 container (62 oz) lemonade, chilled
12 watermelon slices (for garnish, if desired)
In a blender or food processor, puree watermelon, honey and vodka together, working in small batches if needed. Pour watermelon mixture into a large, freezer-safe container and freeze overnight. To serve, grate watermelon mixture with a fork and add to a punch bowl. Pour lemonade over frozen mixture in punch bowl and stir to mix. Serve immediately. Garnish individual glasses with watermelon slices, if desired.