Spiking this sipper with vodka makes a snappy cocktail for summer.

8 cups chopped seedless watermelon (about 6 pounds)

1/2 cup freshly squeezed lime juice (about 4 limes)

2 tablespoons sugar, plus 2 tablespoons more, if needed

1/2 cup vodka (optional)

Mint leaves

Working in batches, puree in blender watermelon with lime juice and sugar until smooth. Add more sugar, if needed.
Transfer puree to a pitcher; add vodka, if desired. Cover; chill until ready to serve.
Stir; pour into tumblers, over ice. Garnish with mint.