A frozen lamb shoulder square cut, bone-in, refers to a portion of lamb meat that has been cut into a square shape, typically including the bone. The meat is taken from the shoulder of the lamb, known for its rich and flavorful meat. This cut is frozen, which helps preserve its freshness and allows for longer storage. It can be used for a variety of dishes, such as roasts, stews, or grilling, offering a delicious and tender lamb flavor.