— By Alex Gayton, Nutrition Education Professional, University of Maine Cooperative Extension With only 6 simple ingredients this is a delicious and refreshing smoothie recipe to keep on hand this summer. I love to use frozen fruit in smoothies because it makes the smoothie cold and helps thicken it to a perfect consistency. Depending on your smoothie read more Mainely Dish Recipe Video: Oatmeal, Strawberry, Banana Smoothie