10 Secret Fast Food Menu Items

Peanut Butter and Bacon ShackBurger at Shake Shack(6 of 10)

Peanut Butter and Bacon ShackBurger at Shake Shack(6 of 10)

This burger topped with tasty peanut sauce used to be on the regular menu, but nut allergy concerns forced the chain to remove the popular option. However, fans have found that many Shake Shack locations will still create the burger if you make a special request. If they refuse, make your own by ordering their peanut sauce on the side, then smothering the burger to your heart's content.