Make the watermelon Juice ahead of time. Take freshly cut off the rind watermelon and add it to a blender. Puree until liquified. Pour into a jar through a mesh strainer.

Rim each glass with salt. Rub a lime wedge around the rim and then dip in salt for best results.

Add the beer, juice, tequila, and lime to prepared mason jar.

Rub the mint leaves between your fingers and then add to glass.