Then add one whole banana, peeled.
Next, add a cup of Acai juice. Acai juice is made out of pure Acai berries that have been juiced, of course. You can usually find it in the organic juice section of your grocery, or next to the orange juice. It's a little pricey, but you can also substitute Acai juice for real orange or apple juice. It must be REAL though (not from concentrate), or you might as well pour in a soda instead.
Add a tablespoon of soy protein powder. If you don't have this on hand you could substitute the powder for a half cup of yogurt. Oikos greek yogurt, plain or vanilla, is my favorite.