I tried the New York Steamer at Firehouse subs today - wow, that was a lot of flavor.
They start with a soft-baked roll, 8" or 12". They pile it high with corned beef and pastrami, melt some provolone on top and then dress it with mustard, mayo and Italian dressing.
I recommend getting those toppings. They add just the right zing and juiciness. A dill spear arrives on the side.
Even with a full house, my lunch was ready in eight minutes. Yay.