I usually hate bananas and I'm not fond of drinking smoothies to begin with. But this one I really like. :-)
You need:
4 ripe bananas, peeled
2 handful dried goji berries
2 cups of water
a blender
Soak the goji berries in the water for about 10 or 15 minutes. Put the berries WITH the water in a blender. Add the four bananas. They need to be well riped. Blend. That's it. :)