McDonald’s is experimenting with something in Dallas that could totally change future operations at the fast food joint.

Instead of using frozen patties, they’ll be using fresh beef at restaurants in Dallas — and just with its quarter pounders, according to a Nation’s Restaurant News report.

It would be one of the biggest shifts in product specifications in the history of the McDonald’s chain. The company said in an email statement on May 12 that the test would take place at 14 locations, and there’s no indication on when — or if — it will be expanded to a broader market.

The test would be limited to burgers that have quarter pound patties, including the quarter pounder with cheese, Homestyle Burger, Bacon Clubhouse Burger, and the double quarter pounder with cheese.

McDonald’s has been working hard to figure out new ways to grow revenue, fighting a slump in sales in the past three years. It’s a pretty big change for McDonald’s, as it has based its entire system on frozen patties. This is not a small undertaking for the biggest fast food franchise on the planet.

“Like all of our tests, this one too is designed to see what works and what doesn’t within our restaurants by considering the operational experience, customer response, price points and other important information, which may inform future decisions,” McDonald’s spokeswoman Lisa McComb was quoted as saying in the report. “It’s very premature to draw any conclusions from this test.”

McDonald’s has 14,000 locations in the United States, far bigger than any other restaurant. Wendy’s uses fresh beef and has about 6,000 locations in North America.

McDonald’s may be hoping to improve its image as a fast food joint with food that isn’t fresh, and more modern chains that appeal to the fresh trend are starting to eat its lunch.