TIP: The easiest way to freeze watermelon cubes is to place them on a waxed paper-lined baking sheet. Once frozen, they will not stick to the paper.
If you have a small blender, you will need to blend half of the mixture at a time.
Ingredients
5 cups frozen watermelon cubes (see Cook’s Note)
1 cup fresh lemon juice
1/2 to 3/4 cup Simple Syrup (recipe follows)
6 thin watermelon or lemon wedges, for serving
Simple Syrup
1 cup sugar
Directions
In a blender, combine the watermelon cubes, lemon juice, and Simple Syrup (see Cook’s Note). Blend until smooth, stopping and scraping the sides as needed. For a thinner consistency, add up to 1 cup cold water and continue blending until smooth. Serve each glass cold with a watermelon wedge and straw.
Simple Syrup
In a small saucepan stir together the sugar with 1 cup water. Bring to boiling over medium-high heat without stirring. Boil until clear, about 1 minute. Pour into a clean heatproof jar and let cool. Cover and store in the refrigerator for up to 1 month.