This place right outside the Pantheon looks like a butcher shop if you weren't paying attention, but they also make delicious sandwiches. I was looking for a panino because my favorite joint near this piazza, Lost Food Factory, closed down. I had porchetta that was delicious and went back another day and had mortadella, which was buttery and light. They charge by the gram; just a few small tables inside but most people seemed to be happy with take out.