Cut your watermelon off the rind and into small chunks. (Remove the seeds if you couldn’t find a seedless one.)
Finely mince the piece of jalapeño.
Put the watermelon and jalapeño in the blender. Add the tequila and salt and top with ice.
Blend until smooth and frothy.
Pour into pretty glasses.
Garnish with a watermelon wedge and one thin slice of jalapeño, to alert your guests that this will be spicy.
Add an extra sprinkle of flakey sea salt, if desired.
Put the pitcher in the freezer between servings. It’s even better when it gets a little frozen.
Enjoy!