01 -
Cut the watermelon into cubes and remove any seeds.
02 -
In a blender, combine the cubed watermelon and lime juice. Blend until smooth.
03 -
Add ice cubes to the blender and blend until a slushy consistency is reached.
04 -
Taste the mixture and add sweetener if desired; blend again briefly.
05 -
Pour into glasses, garnish with mint leaves if using, and serve immediately.