Reprinted by arrangement with Avery Books, a member of Penguin Group (USA) LLC, A Penguin Random House Company. Copyright © Virpi Mikkonen and Tuulia Talvio, 2016.
Note! You can also make the slush from non-frozen cucumber and apples by blending all the ingredients in a blender and then running the mixture in an ice cream maker for about 15 minutes.