Place the watermelon chunks into the pitcher of a blender. Cover and puree until smooth.
Strain the watermelon, reserving the juice. Discard the pulp.
Place 1/4 cup of watermelon juice, vodka, and lime juice into an ice filled cocktail shaker. Cover and shake to thoroughly combine.
Strain cocktail into an ice filled copper mug. Top with ginger beer, and garnish with watermelon wedge and mint sprigs.
Notes
I threw a bunch of watermelon chunks into the blender and made enough juice to make about 5 cocktails. I stored the leftover juice in a glass jar in the refrigerator just in case I needed to make another one.
I squeezed the lime wedge into the cocktail shaker, and then tossed the lime in. A little extra flavor is always a good thing, right?
I use these copper mugs, and this blender to puree the watermelon to perfection. {affiliate links}