Chevys is famous for margaritas made with fresh, pureed fruits. While these drinks usually come in blended form combined with house margarita mix right out of a machine, they are much better when ordered on the rocks. Here now is a clone of the most popular flavor, watermelon, made by simply pureeing some fresh melon in your blender. First cut some ripe seedless watermelon from the rind, and then coarsely smash it in a bowl with a potato masher or large fork (this gives the blender something to grab on to). Pour the melon from the bowl into a blender and blend on high speed for 10 seconds or until the watermelon is pureed.

Source: Top Secret Recipes: Sodas, Smoothies, Spirits & Shakes by Todd Wilbur.