The firm announced on Wednesday that it is launching a pilot program in 28 stores throughout the U.K. that will offer customers 3 new “signature” burgers with thicker patties that were “created by McDonald’s team of food specialists and their prestigious Chefs Council.” The collection includes classic, BBQ, and spicy varieties.

According to a report in the Guardian, the burgers could find their way into more stores around the world if they prove popular in the U.K. The decision to launch the pilot was likely in response to the increasing popularity of higher-scale fast food restaurants like Shake Shack, the paper said.