Forget PB&J. The lowly sandwich has gone upscale, taking center stage at restaurants and in appetites. Some are even worthy of a glass red wine and candles, says Susan Russo , author of The Encyclopedia of Sandwiches (Quirk Books, .95). Thanks to an explosion of gourmet shops, “a sandwich can be elevated to a pretty elegant meal,” she says. Russo shares some favorite spots with Larry Bleiberg for USA TODAY. The humble sandwich has gone upscale at any number of gourmet shops.