Its a little late n the season but in cleaning up the computer I found it (). Maybe you can try it next watermelon season.
Makes 4 servings
Preparation : 20 minutes
Chilling time : 1 hour
6 cups Watermelon
¼ cup Raspberries
½ cup fresh Lemon juice
1 cup water
1/3 cup Sugar
Place watermelon, raspberries and water in a blender, blender until smooth.
Strain through a fine sieve into a pitcher.
Stir in sugar and lemon juice until sugar dissolves.
Personnel note – a little vodka in it makes it a wonderful adult drink !