Use a knife and cutting board to cut the ripe watermelon into roughly 1-inch chunks. Remove any seeds if present. Transfer the chunks into the blender.
4 cups watermelon chunks
Add fresh mint leaves on top of the watermelon chunks in the blender. Squeeze the juice of a lime directly over the ingredients.
10 fresh mint leaves, 1 lime lime juice
Secure the lid on the blender and blend on high speed until the mixture is smooth, about 30-45 seconds. Observe the mixture for a slightly fibrous texture, with tiny bits of watermelon and mint suspended throughout, and a vibrant red color.
If the smoothie is too thick or fibrous for your preference, add cold water or ice cubes and blend again until the desired consistency is achieved. The mixture should be pourable but retain tiny fibers and a refreshing appearance.
1 cup cold water or ice cubes
Pour the smoothie into glasses, allowing some tiny fibers to remain visible. Optionally, garnish with a sprig of mint or a small lime wedge before serving.
