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While McDonald’s may have popularized the idea, others, like In-N-Out Burger—founded in 1948—were among the first to offer a recognized "secret sauce," called Spread. Soon afterward, chains like Jack in the Box and many others joined the fray.
The Rise of Unique Offerings
Every fast food chain now has its own signature sauce that customers rave about, with Chick-fil-A sauce often highlighted for its smoky mustard profile. This sauce was created in 1983 and remains popular enough to demand its bottled version in supermarkets.
Similarly, Raising Cane's Cane Sauce is noted for its tangy, vinegary flavor, while Wendy's Sawsome Sauce combines tangy, sweet, and smoky elements, becoming a fan favorite even after the chicken strips it accompanied were retired from the menu.