Pretty sure hooves, eye balls, and arse holes all qualify as part of a cow and there for as beef.
Sure mock what ever you reckon. And no they don't. Keep trying and keep making stuff up. They even have a section on what cuts of meat are used for the patties. The Maccas meat patty probably has a greater percentage of beef than the ones you make yourself.
Its funny, desserts aside the apples have a much higher sugar content than all the burgers. Lol. Even the salads have more sugar. Lol.