WE are a city of heroes. The rest of the country may clamor for po' boys and hoagies, grinders, subs, wedges or torpedoes, but New York knows what really constitutes a gigantic sandwich, and what raises the hero above those pretenders; what makes it gastronomic royalty. Let there be no misunderstanding by those who have never ventured to New York, or by those who have come lately, or by those who diet. The hero is a sandwich of cured Italian meats. These are layered into a forearm's length of fresh crusty bread, often with a few slices of Italian cheese...