Shelf-stable food items have, needless to say, never been more popular. The bean business, in particular, is booming — according to recent reports, Goya’s sales have increased some 400 percent. But for those whose legume repertoires are beginning to feel a tad stale, it might be worth considering other areas of the canned and tinned universe, many of which are also quickly gaining traction. Anchovies, long the topping “held” from a dish, are taking center stage on Instagram (in sandwiches,