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The Big Mac Special Sauce.
McDonald's

In celebration of two new sandwiches, fast food giant McDonald's is giving away 10,000 bottles of the sauce that makes its burgers Big Macs.

The U.S. giveaway, starting Friday, comes after the company introduced the Mac Jr. and Grand Mac burgers, according to a Tuesday press release from the company.

While those two burgers will be available through March 20 while supplies last, McDonalds has yet to reveal where consumers can get its Big Mac Special Sauce.

The company announced that quantities would vary at participating U.S. locations, but said it would only reveal where and how to get a bottle on Wednesday.