I make the sour cherry smoothie just as the strawberry morning
smoothie (here), just keeping it simple.
To a handful of fresh sour cherries (it can be frozen, too) add some plain yogurt and more or less milk, depending on the texture you want to get. I recommend to add some sweetener, too cos the yogurt and the cherry will be very sour together. I usually add honey. After blending i add some cinammon powder cos i think they goes well together ^^