The stuffing leans on walnut and pomegranate molasses rather than the rice fillings common elsewhere in Persian cooking — a pairing shared more with Caucasus cuisine than with central Iran.
A whole fish — often kutum, a Caspian Sea specialty — is stuffed with a paste of ground walnuts, fried onion, garlic, and pomegranate molasses, then baked or grilled whole. Fish stalls along Gilan's Caspian coast sell it whole, bones and all, wrapped for takeaway.