You can’t go wrong with a sandwich. That’s what most Americans think, anyway. In fact, according to the US Department of Agriculture, on any given day in the US, nearly 50 percent of adults eat at least one sandwich for lunch or dinner. There are, of course, many different types of sandwiches. But among the most popular has to be the sub—or the po’boy, if you’re in Louisiana, the hoagie if you’re in Philadelphia, or the spuckie if you’re in Bost…