What are those little things inside hamburger meat?

I was eating a hamburger last night and as I was chewing, I noticed that there was a little hard “rock” that I was trying to chew into. I’ve noticed this on several occasions from different restaurants where I’ll get a burger from. What exactly am I eating?

Probably small bits of bone or cartilage.

A piece of bone, most likely.

They’re called ‘prions’.

:dubious: