This dish, often called zereshk ba morgh, is a popular iranian meal of chicken and rice with saffron. The word morghe means chicken and polo means rice. The word zereshk means barberries, which are common in persian rice dishes. The berries have a sharp, sour flavor and are often cooked with a bit of sugar before being added to saffron rice. You can source them in middle eastern markets and specialty stores but if you can't find them, we recommend using dried cranberries, which are more readily available and provide a similar sweet and sour flavor. As with so many middle eastern dishes, there are lots of variations for this dish, but the key components of chicken, rice, saffron, and berries are always included. Although there are a few steps involved, the actual cooking process is fairly simple.