Despite the Italian-sounding name, the dish was invented in Chile, not Italy — parmesan was simply the fanciest cheese a Valparaíso cook could reach for.
Razor clams on the half shell are topped with butter, white wine, and grated parmesan, then flashed under a grill until bubbling. Stalls at Valparaíso's Caleta Portales fish market serve them by the dozen straight off the coals.