The same walnut-and-sour stuffing turns up across the border in Azerbaijan's Lankaran region, where lavangi is made with chicken as well as fish.
A whole fish — often kutum, a Caspian Sea specialty — is stuffed with a paste of ground walnuts, fried onion, garlic, and pomegranate molasses or sour plum paste, then baked or grilled whole. It's a home and restaurant dish along Gilan's Caspian coast, especially in the Talysh area.