Corner Mercantile is a tasty corner gourmet sandwich shop in downtown Pittsburgh. The bread to meat portion is on-point, meaning there's plenty of meat and the bread is petite. It's a perfectly healthy lunch size. We tried their prime rib sandwich (served Tue and Thu) and loved it! The prime rib was moist, thinly sliced, and salted. I would've loved it more if they had some mushroom/onions to go with it. Or something crunchy to play up the texture. That's something to ask for next time on my part.