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The Arch Deluxe was a signature hamburger sold by McDonald's in 1996 and marketed
Arch deluxe
specifically to adults.

The Arch Deluxe was a quarter pound of beef, on a split-top potato flour sesame seed bun topped with a circular piece of peppered bacon, leaf lettuce, tomato, American cheese, onions, ketchup, and a "secret" mustard and mayonnaise sauce.

It was soon discontinued after failing to become popular despite a massive marketing campaign and now is considered one of the most expensive flops of all time.