A roast beef sandwich is an iconic deli staple across the United States. Depending on the region in which it's made, it might come in a crusty loaf with a side of broth for dipping, in a soft bun ...

It offers only a few things: roast beef and ham sandwiches, cheese and crackers, and a few soups. The roast beef is hot, falling-apart tender, and dripping with juice.

Juicy and complex, roast beef sandwiches hit the spot when simpler ones don't. What separates it is that the beef is slow roasted so that it's medium-rare on the inside but browned on the outside.

My InsiderSubway is one of the largest global chains, but its ubiquity hasn't necessarily led to an overly positive public opinion. I'll admit that I've been let down by the restaurant more than ...