The herb-and-rice dish traditionally eaten with fish on Nowruz is Sabzi polo.
Sabzi polo is a Persian rice dish made by layering cooked rice with chopped herbs. Common ingredients include dill, parsley, cilantro, chives or scallions, garlic, and sometimes fenugreek. The name combines sabzi, meaning herbs or greens, with polo, a Persian style of pilaf.
For Nowruz, it is traditionally served with fish, especially white fish such as Caspian kutum in Iranian households. The combination is particularly associated with the New Year meal and is often shared with family and relatives. Pickled garlic and other pickled vegetables may accompany it.
Sabzi polo is not the same as other Persian polo dishes. Albaloo polo contains sour cherries, loobia polo includes green beans, and tahchin is a savory rice-and-yogurt dish often prepared with chicken or other fillings. The fish pairing is the key clue here.