Combine all the ingredients together in a blender.
Blend until all the ingredients are combined and smoothed.
Then strain the mixture to ensure that all the seeds are removed.
Pour over ice, Serve with the sliced lemons and enjoy!
Notes
Makes about 7 cups (roughly 4 servings at 1¾ cups each). Doubling for a crowd? Use 8 cups watermelon, 4 Tbsp sugar and 8 cups lemonade, and split between two pitchers."