C’mon! Sing it with me: “Two all-beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun.” That’s the classic McDonald’s Big Mac! But back up for a second… “special sauce”?

Add Yahoo as a preferred source to see more of our stories on Google. an image of big mac sauce in a bowl - Bhofack2/Getty Images While McDonald's maintains that nobody has been able to crack their ...

While McDonald's maintains that nobody has been able to crack their famous "secret sauce" recipe yet, that doesn't mean the world hasn't been trying. It's so beloved that even McDonald's promised to ...