Normal beef tendon is a part of cattle. Generally speaking, meat is meat. According to Buddhism, not all meat is meat. Just as not all plants are vegetarians. For example, onions are vegetarian and garlic is meat. But now industrialization is too strong. The age when beef noodles can turn other meat into beef, and the age when vermicelli becomes fishbone. It's hard to say whether those bagged beef ribs are meat or vegetarian.