16. What cuts of meet are used in McDonald's beef patties?

McDonald's uses forequarter and hindquarter trimmings, as well as whole muscle cuts in its beef patties.
McDonald's Australia explains in more detail:

"Beef trimmings are portions of meat remaining after the preparation of the whole muscle cuts. Forequarter refers to the front half of a side of beef and hindquarter refers to the rear half.

Whole muscle cuts, or primals as they are referred to in the industry, are defined portions of a side or beef (or carcase). Forequarter primals include the blade, brisket, chuck, and spencer roll, amongst others and the hindquarter includes primals such as the hind shank, silverside, thin flank and topside.

The primals that may be included in our beef raw materials are usually from the forequarter, and typically include the chuck and the blade."