Sour black cherries are not readily available in many areas. However, table cherries can give almost the same flavour with the addition of more lime or lemon juice, making this khoreshe possible. Perhaps the flavour will not be quite the same, but it will be just as enjoyable.
Morello cherries, though not the same as the sour black cherries of Persia, may be used with less adjustment to the tartness of the dish; the morello is thought to be a descendant of the albaloo, the Persian sour cherry.
If one wishes to be pedantic, when using the sweet table cherry, the name of the dish should be khoreshe guillass. However, a Persian would not have heard of such a dish!