Besugo al Horno Cántabro

Besugo al horno is Cantabria's winter celebration fish: a whole blackspot sea bream roasted over patatas panaderas, the soft potato-and-onion bed, with white wine, lemon, and a garlic-pimentón refrito spooned over at the end. That bed and the warm red oil give the Cantabrian preparation its shape. The fish reaches the Christmas Eve table in its baking dish, its silver-rose skin browned at the edges and the potatoes full of its juices.

The point that decides it is time. Bake the potatoes nearly tender before the fish goes over them, then watch the thick shoulder rather than trusting the clock. When the flesh parts cleanly from the backbone and still shines with its own moisture, take the dish out. Don't leave an expensive fish in the oven while you wait for it to look more cooked. By then it already is.

True besugo is blackspot sea bream, Pagellus bogaraveo. If it isn't sold where you live, a whole dorada, or gilthead bream, is the honest substitute a fishmonger in Spain would offer. Dorada is milder and often smaller, so begin checking it after 15 minutes and stop at the same doneness. No hace falta haber pisado España. Ask the fishmonger to clean it, weigh it, and keep the head and bone in place. The Margin beside this one says only, "potatoes first, fish last."