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SAN FRANCISCO (CBSDFW.COM/AP) – To get customers to come into McDonald’s and buy new versions of its Big Mac, the fast food chain is giving away 10,000 bottles of its trademark ‘special sauce’ for people to use at home.

The move is to celebrate the introduction of the new Mac Jr. and the Grand Mac, two different-sized variations of the classic sandwich.

The giveaway is a first in the United States.

McDonald’s introduced the Big Mac in 1968. But in 1975, the ‘special sauce’ got its own callout in the signature Big Mac commercial, touting the burger’s components: “Two all-beef patties, special sauce, lettuce, cheese, pickles, onions on a sesame seed bun.”

The bottles will be available Thursday at participating locations nationwide. Click here for details about which locations will be handing out the bottles, and what customers must do to get one. There is also an option for people who are not near one of the participating locations to win a bottle on social media.

(©2017 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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