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For the first time, McDonald’s has bottled and will be giving away its iconic Big Mac Special Sauce — 10,000 nationwide and a limited number at two Bay Area locations.

Related Articles McDonald’s adds 2 new Big Mac sizes (junior and grand) The McDonald’s at 2699 Union Ave. in San Jose and 235 Front St. in San Francisco will start handing out their supply at noon Thursday, Jan. 26. To get a free bottle, customers have to share the phrase, “There’s a Big Mac for that.” (Sorry, the original jingle won’t work, though you get points for committing that to memory decades ago.)

Only customers 18 and over can take advantage of the offer.

The promotion comes just after McDonald’s unveiled two new Big Mac sizes — A Mac Jr. and a Grand Mac — at all U.S. locations. The Mac Jr. has just one burger patty; the Grand Mac comes with bigger patties on a bigger bun.

What differentiates the Mac Jr. from a regular cheeseburger? The special sauce instead of ketchup. And naturally, there is no need for a middle bun.

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Is this giveaway a prelude to selling the sauce at McDonald’s restaurants or in retail stores? A Bay Area McDonald’s spokeswoman won’t say, but there has been industry speculation that that’s the plan.

According to the Chicago Tribune, the company applied for a “Mac Sauce” trademark last September in the United States and tested sales of bottled sauce in Australia earlier in the year. The experiment was a grand success, with bottles reportedly selling out quickly.