Secret of the Secret Sauce revealed!
It's not just mayo and ketchup
McDonalds' Big Mac Secret Sauce is no longer such a secret. And it isn't, as many people have claimed, just mayonnaise and relish or just mayonnaise and ketchup. Oh no, my friend! It is mayonnaise, sweet pickle relish, yellow mustard, white wine vinegar, garlic powder, onion powder and paprika.
(The paprika adds a slight bit of taste, but is mostly there to add color. The color of the added paprika is no doubt what caused a lot of people to believe that Secret Sauce involved ketchup somehow.)
The secret was revealed in an official YouTube video where the company's executive chef answered questions from the audience. Someone asked what is in McDonalds' secret sauce, and Dan Coudreaut revealed the answer.