Which fast food chain's brand identity includes a secret sauce that was originally called 'Special Sauce X-191' during its development in 1968?

Behind every successful food brand lies a carefully crafted identity that consumers instantly recognize. One powerful element of brand identity in the food industry is the creation of signature sauces that become synonymous with the restaurant chain. These proprietary condiments often become cultural icons themselves, driving customer loyalty and differentiation in a crowded marketplace. Test your knowledge about these famous brand identity elements that have helped shape some of the world's most successful food chains.

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McDonald's
Burger King
Wendy's
In-N-Out Burger