Add the cucumber, kale, grapes, ice, parsley, lemon juice and apples to the carafe of a powerful blender. Blend on high until everything is homogeneous and smooth, adding 1 to 2 cups water as needed.
Pour into glasses and serve immediately.
If you do not have a high powered blender, be sure to add greens on the bottom and pulse to combine before running the blender continuously.
Recipe courtesy of Gabriele Corcos and Debi Mazar