Even if you don't think Leo's makes the best cheese steak in Philadelphia (as do many loyalists), there can be little doubt that it makes the biggest: over half a yard of Amoroso Bakery Italian bread laden with pounds of beef and onions all trowel-cut on the griddle into a fine hash and saturated with melted cheese. If you give the management two days notice so the bread can be baked, you can get hoagies that are three or six feet long.