Deviled Oysters with Mustard Sauce

It’s no secret that Southerners eat mayonnaise on practically everything but chocolate, but one unique trait of Southern cookery that often goes unnoticed by those outside the region is the use of mayonnaise in place of milk and cream products in numerous toppings for baked dishes—large casseroles included. No doubt this would make some cringe, but the truth is that mayonnaise not only binds other topping ingredients like nothing else but it also produces a nice glaze on dishes, such as the