Via the Washington Post:
Arby’s faced a key problem as it moved to attract customers: People thought the restaurant served mainly roast beef. To change that, the company made this poster showing a tall stack of every meat on the menu, from bacon to brisket. And then something unexpected happened. “People started coming in and asking, ‘Can I have that?’” said Christopher Fuller, the company’s vice president of brand and corporate communications. So Arby’s began granting their wish. The “Meat Mountain,” as it’s called, will not be listed on the menu, but store associates will make it for customers who ask. The price is $10.
The sandwich is too big for ordinary Arby’s boxes and will come wrapped in paper. Hit the link for the ingredients.