Wash and dry the fresh mint leaves. Cut the watermelon into 1-inch cubes on a cutting board using a sharp knife. Juice the lime using a citrus reamer or juicer, removing any seeds.
4 cups cubed watermelon
Add the watermelon cubes, lime juice, mint leaves, and salt into the blender jar. Ensure all ingredients are evenly distributed.
4 cups cubed watermelon
Secure the lid of the blender and blend on high speed for about 30-40 seconds, until the mixture is completely smooth and frothy with visible small flecks of mint.
Stop the blender and check the texture; it should be icy, thick, and uniformly blended. If desired, add a few ice cubes and blend again for extra chill and texture.
4 cups cubed watermelon
Pour the smoothie into glasses. Garnish with a sprig of mint or a small lime wedge if desired. Serve immediately with a straw for a refreshing experience.
4 cups cubed watermelon