The original of a growing countrywide chain, this is the birthplace of the trapizzino, a kind of hybrid sandwich made by stuffing a cone of doughy focaccia with fillers like polpette al sugo (meatballs in tomato sauce) or pollo alla cacciatore (stewed chicken). They're messy to eat but quite delicious. Eat in or take away; beer and wine available.
There's another branch in the Mercato Centrale, next to Stazione Termini.