What about kaszanka, Blutwurst, boudin, black pudding, etc. Don't they all contain blood?
They do, and I wouldn't touch any of them.
it mostly contains cut-up morsels of cooked head meat: snout, cheeks, jowls, ears, lips and tongue.
Vile. I had brawn as a child and it was disgusting. Never heard it referred to as head cheese though.