Fried Roast Beef, "Hulaburger," Hot Dogs, and other weird menu items from McDonald's.

There's an incredible Wikipedia page about McDonald's products.

Hulaburger: A Ray Kroc invention, it featured a slice of pineapple instead of meat. Originally intended for Roman Catholics who were not allowed to eat meat on Fridays. It flopped when it was test-marketed in 1963.

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Postscript: also check out the international menu items.