Prep the watermelon: Remove the seeds and cut the fruit into cubes.
Blend: Add watermelon, mint, lime juice, and optional water into a blender. Blend until smooth.
Strain (optional): To achieve a smoother texture, pass the blended mixture through a fine mesh strainer or a nut milk bag.
Serve: Pour into glasses over ice. Garnish with mint leaves and a lime slice.
Adjust sweetness: Taste the juice. Add honey or agave if desired.
