Ingredients (yields 5 servings.):
4 cups cubed seedless watermelon
3/4 cup frozen lemonade concentrate, thawed
2-1/2 cups carbonated water
1. Place watermelon in a blender.
2. Cover and process until blended.
3. Strain and discard pulp and transfer juice to a pitcher.
4. Stir in limeade concentrate.
5. Refrigerate for 6 hours or overnight.
6. Just before serving, stir in carbonated water.
7. Garnish servings with lemon slices.