1/3 cup sugar
1/4 cup water
1/3 cup light corn syrup
2 cups pureed watermelon
1 tablespoon lemon juice
Combine sugar, water and syrup in a saucepan. Stir until it boils. Reduce heat and simmer for 5 minutes. Let cool. Refrigerate. Remove meat from the watermelon and discard seeds. Puree in a blender. Measure and add 3 cups of watermelon and lemon juice to the cold sugar, water, syrup mixture. Pour into machine for 20-30 minute or until desired consistency.