(I always thought it was a big secret, like KFC’s secret spices!)
McDonald’s Canada has posted a video on YouTube featuring its executive chef showing how to make the famous secret sauce in your own kitchen!

All you need is mayonnaise, sweet pickle relish, yellow mustard, white wine vinegar, garlic powder, onion powder and paprika.

Thanks to Christine H. from Oshawa, Ont., who submitted the question to McDonald’s in the first place!