Del's Frozen Lemonade is the original frozen lemonade, and is found only in Rhode Island. It comes in a plethora of sizes, and in a few different flavors. Many companies (including Coca-Cola) have tried to duplicate it, but they all fail terribly.
Del's comes in a green and white cup with a lemon slice at the bottom. You can either use a funky spoon to eat them, or just lick/bite the top and squeeze the cup to get the rest. Either way, they are the most refreshing thing to have on a hot summer day in Rhode Island.
Some history stolen from www.famousfoods.com: Del's was invented in Naples, Italy in 1840 by a man surnamed DeLucia. Angelo DeLucia, his grandson, started selling it under its present name in 1948 at a store in Cranston, RI.