The no-carb craze has taken many forms over at least two decades—there’s Atkins, Paleo, the carnivore diet, Whole 30—all special in their own way, but with a shared distrust and dislike of bread. To keep up with the times, sandwich places commonly offer their wares in the form of salads, with fillings ripped from buns and rolls, chopped and distributed across a bed of leaves.