Chick-fil-A's chicken sandwich uses the chain's original recipe, emphasizing the importance of preserving popular menu items.
Fast-food chains like Taco Bell and Burger King are innovating with new items while also maintaining classics like Wendy's nuggets.
McDonald's iconic hamburgers date back to its 1940 inception, and the Filet-O-Fish was introduced in 1965 to boost Friday sales during Lent.
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