Location: Taxca, Rua da Picaria 26, 4050-477 Porto, Portugal
Getting there: São Bento station
Hole-in-the-wall local spot, cheap and very popular with locals
Specialty: Bfina — thin-sliced pork in spicy broth in a crusty roll
Price range: $ (~10)
Pro tip: So good they went twice in one trip. Also order the codfish cakes
Recommended by @Pitufueros