McDonald’s wants to find out if consumers prefer fresh hamburger patties to frozen ones.

Testing has been underway at 14 McDonald’s restaurants in the Dallas, Texas area.

The testing has been going on since late 2015. McDonald’s spokesperson Lisa McComb said that the results of the testing are not complete.

The fresh beef test is part of a larger strategy for the fast-food giant to bolster sales. McDonald’s is testing garlic fries in San Francisco, and a Grand Mac and a single-patty Mac Jr. in some restaurants in the Dallas area as well as in Ohio.

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