Blueberry-Watermelon Frosty Smoothie

YIELD: 4 servings

6 oz. frozen lemonade or limeade concentrate, thawed
2 cups fresh blueberries
2 cups watermelon cubes, seeds removed
1 cup ice cubes

1.    In blender, combine lemonade concentrate, blueberries and watermelon. Puree until very smooth. Add ice cubes; blend until mixture is slushy. Add sugar, if needed.