NEW YORK (AP) — The Quarter Pounder is getting a fresh makeover.

McDonald's said Tuesday that it is serving Quarter Pounders with fresh beef rather than frozen patties at about a quarter of its U.S. restaurants, a switch it first announced about a year ago as it works to appeal to customers who want fresher foods. It will roll out fresh beef Quarter Pounders to most of its 14,000 U.S. restaurants by May.

The fast-food giant, which has relied on frozen patties since the 1970s, said workers will cook up the fresh beef on a grill when the burger is ordered.

"The result is a hotter, juicier, great...