To get watermelon juice, simply puree chunks of watermelon in your blender. Make more than you'll need for this recipe and refrigerate the juice up to 2 days. Pour over ice or mix with lemonade for a fun drink for kids and adults alike.
f you don’t have a cocktail shaker, use a pitcher and stir the mixture well.
For an authentic touch, salt the rims of the glasses. Rub the rims with a lime wedge and then dip in coarse salt.