In a blender, process the watermelon chunks, lime juice, and mint leaves until smooth.
4 cups watermelon, 1 Tablespoon lime juice, 4 mint leaves
Strain the watermelon mixture, if desired, and set aside.
Fill your glasses with ice.
ice
Pour the watermelon mixture over the ice to fill each glass ¾ of the way to the top.
Top each glass with sparkling water, garnish with lime slices (if desired) and enjoy!
sparkling water, lime slices
Notes
Refrigerate any leftover watermelon mixture (before adding the sparkling water) in a container with a lid for up to 3 days. Or freeze, leaving room in the top of the container for expansion, for 1-2 months. Defrost in the refrigerator overnight.