Beef is the name for meat that is from bovines particularly cattle. It can be harvested from bulls, cows, heifers or steers and is eaten as a food source in many different parts of the world.
It can be cut into roasts, short ribs, or steak and some cuts are processed and trimmings used in all kinds of foods like sausages.
image wikipedia
So can rabbits eat beef at all?
Unfortunately, rabbits cannot eat any kind of meat at all.
Rabbits are strictly herbivores and do not like any kind of meat food. So will not touch it.
Even if they take a nibble at it, they wont take it any further, and if they do happen to eat a little of it they should be fine.