This ice cream is so fluffy and light, and not overly sweet. If you are wondering why the vodka is necessary, it is because watermelon has a high water content which tends to ice up in the freezer. Since the vodka has a high alcohol content, it displaces the ice crystals so that the whole mixture doesn’t turn into a solid block of ice once it’s left in the freezer to ripen. When you pull it out of the freezer, if there is any left to put into the freezer, be assured you will need to let it thaw some before you will be able to scoop some out. Again, this is due to the water content.