The sandwich is the ultimate exercise in edible gestalt: Great vegetables, cheeses, meats, and breads make, in the aggregate, something so much more wonderful than any one ingredient alone. While there’s a time and a place for ten-ingredient Dagwoods and double-decker club sandwiches, there’s a particular magic to be found in the very simplest sandwiches. These nine sandwich variations call for just two ingredients each (plus bread, of course, and the occasional grind of pepper); they are, in our opinion, the very pinnacle of lunchtime perfection.