The rapidly-growing Raising Cane's sold over $5 billion last year, and the Baton Rouge-based chicken-finger chain's famous Cane's sauce is a key part of its success.

But how does Raising Cane's keep its beloved sauce recipe a secret? A Tuesday Wall Street Journal report describes the effort that goes into protecting the recipe.

Despite the hundreds of alleged copycat recipes that have been shared online, according to The Wall Street Journal, there is only a handwritten physical copy of the original sauce's ingredients.

Written 30 years ago by one of the company's co-founders, the recipe is locked in a safe in an undisclosed location.

There have been attempts to replicate Cane's sauce, which is apparently based in ketchup, mayonnaise, and Worcestershire sauce, but the owners swear f

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