Freeze the bananas ahead: peel, slice and freeze them in a bag for at least 4 hours. With a fresh banana, add 4 or 5 ice cubes. Roasted carob powder tastes most like chocolate; raw carob powder is lighter and fruitier, so use it for a fully raw smoothie. For a darker chocolate orange smoothie, swap 1 tablespoon of carob for raw cacao powder (it adds a little caffeine). Drink it fresh: the orange can turn slightly bitter after a few hours. Nutrition is calculated without the optional dates.