Before I went to Porto, a colleague of mine told me that the one thing I had to do in the city was eat a francesinha. Having never heard of it, I researched before I went, and promptly decided that this ham, sausage and roast meat sandwich, which is smothered in melted cheese and a beer and tomato sauce, was definitely something I needed to try. So, on my first day in Porto, I made a beeline for a local café, and did just that. Rich, cheesy, decadent and oh-so-filling, this was one of the most delicious sandwiches I’ve ever eaten.