A gloppy, meaty, cheesy brick served in a pool of sauce and with a mountain of fries: please meet the francesinha, the culinary pride and joy of the city of Porto. Today, restaurant billboards proclaim in many languages that they serve the best version in the world, revealing the genuine power of this artery-clogging combination that, incredibly, was originally conceived as a snack. We have to say it though: eating a francesinha is worth every last calorie. This dense sandwich, which is impossible to eat just with your hands, is often considered the lusophone version of the croque monsieur.

Forget the famous francesinha. The best sandwich in Porto – arguably in the country – can be found in a little 1970s tile-lined eatery; the unremarkable interior belies the iconic status of its most celebrated dish. Served up on the corner of Praça Poveiros, a square named after the fishermen from the storied maritime city Póvoa de Varzim, located just north of Porto, the sandes de pernil (roast pork sandwiches) are a curious joy to watch being assembled as well as, of course, to eat. One by one, roast pork legs are slowly cooked in the huge oven in the kitchen behind the bar of Casa Guedes. They are then served directly from the roasting tray by the owner himself, Mr. Cesar.

“It’s not enough,” says the waiter at O Pascoal. We had inquired if one dish would be sufficient for three people, and his reply is immediate, firm and confident. We take his advice, order another, and the two dishes are easily enough for six people (we are three). We are in Fajão, an aldeia do xisto, “schist village,” in inland, central Portugal’s Beira region – about a two-and-a-half hours’ drive from Porto, or around three hours from Lisbon – and this interaction is the perfect introduction to the almost comically hearty cuisine of this area.