Cook's Illustrated, August 1995, Number Fifteen
Ice Cream/Frozen Yogurt
minus 1 tablespoon
* see note
Peel and seed watermelon and puree flesh until smooth. Should make 2 cups. Combine watermelon with remaining ingredients in large bowl. Stir for several minutes until sugar has dissolved. Pour mixture into small container and refrigerate until mixture is no more than 40F. Pour chilled mixture into container of ice cream machine and churn until frozen.
Note about vodka is missing!