Rub the lime wedge over the rim of the glass you will be using. Place the salt in shallow dish. Turn the glass upside down and gently dip it into the salt. Move it around to cover the rim of the glass.
Add the frozen watermelon, ice, tequila, lime juice and agave to a blender.
Blend well until smooth.
Pour into the salted glass and enjoy!
Notes
Depending on how sweet your watermelon is you may want to omit the agave which adds sweetness.
The watermelon will need 2-4 hours to freeze. I like to freeze it the night before I plan on making these.
You can swap in mezcal in place of tequila for a smokey finish.
Feel free to use simple syrup instead of agave if desired. Try this quick microwave simple syrup in a pinch!