Combine watermelon, lime juice, and sugar in a blender. (You may need to do this in batches).
Puree watermelon until totally smooth.
Transfer juice to a pitcher. (Strain through a fine mesh strainer first to remove pulp, if preferred.)
Serve juice cold, garnished with a lime slice (optional). Enjoy!
Notes
Feel free to adjust the amount of sugar to taste, leave it out altogether, or replace it with honey or maple syrup.Check out info before this recipe card for more tips!