The reason i prefer burger king is that i hear in McDs they use all kinds of cow parts like brain and kidneys and other non eatable stuff... other than that Bic Mac tastes more greasy and slightly better than Burger king
i hate mcdonalds..the only thing ill eat from there are there chicken selects or theyre premium chicken sandwhiches....
everything else sucks...why eat that regurgitated pig shit it has so many preservatives in it that it wont rot. disgusting.
I have always believed it to be a thousand island sauce.
You got me curious so I googled it.
This is what wiki says, but without someone on the inside at Mcdonalds who really knows.
Special sauce
The name comes from a 1975 advertising campaign featuring a list of the Big Mac's ingredients: "Two all beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun." The precise recipe for what McDonald's itself now calls Big Mac Sauce remains a secret, but it is recognized as a variant of Thousand Island dressing.[1]
Big Mac Sauce is delivered to McDonald's restaurants in sealed canisters designed by Sealright, from which it is meant to be directly dispensed using a special calibrated "sauce gun" that dispenses a specified amount of the sauce for each pull of the trigger.[9] Its design is similar to a caulking gun.