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McDonald's is giving away 10,000 bottles of its signature Big Mac Special Sauce at select stores around the country — including one in Utah.

On Thursday, 80 bottles will be given away at the McDonald's at 4452 S. 300 West, Murray. Bottles will be given away on a first-come ,first serve basis beginning at 1 p.m. Customers must be 18 or older and say the code phrase "There's a Big Mac for That" to earn the exclusive prize.

McDonald's has never sold its special sauce in the U.S., company officials say. The promotion celebrates the release of two new versions of McDonald's iconic burger — the Mac Jr. (one fewer patty) and the Grand Mac (bigger, with 1/3 pound of meat). These twists on the famous sandwich contain the seven iconic ingredients listed in the popular jingle: "Two all-beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun." They are available through March 20 at all McDonald's locations.

In addition to the giveaway, bottle No. 10,001 will be auctioned off on Friday to benefit the Ronald McDonald House Charities.