Whip up your favorite sangria recipe (or open up your favorite carton, I won't judge) and pour it into a large container. Place in the freezer for 24-48 hours, depending on the size, until fully frozen.
When rock solid, use an ice cream scoop to fill your glass with the frozen nectar. Grab the lemonade and pour it over the slush until your glass is full.
Grab a book, some sunglasses and enjoy your drink in the sun :)