Making of a Francesinha
If there's one food item directly associated with Porto, it's the Francesinha ("French Lady").
You start by making a sandwich out of what us Yanks would call Texas Toast. Put on some steak. Some ham. Some sliced up Chourico. And maybe even a few other meats. Add some cheese.
Cook that in a panini press. If you so desire, put a fried egg with a runny yolk on top of *that*. Put some cheese over that (if using an egg, cut out little holes in the cheese so that the yolk peeks out), and melt the cheese under a broiler. Then, put that on a bed of fries. Then cover the entire thing with a tomato-and-beer spicy gravy.
Yeah, it's a heart attack on a plate. I'm surprised we don't have a variation in the States.