Top Secret Recipe Version, from Todd Wilbur. You will need to puree fresh watermelon in a blender for this recipe. 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 it is pureed.