Thanks allot T'wit, first for reminding me of the cow udder (which I could not get off my mind yesterday) and now for the revelation that Braunschweiger, formally a favorite of mine (with mayo & onions) is, in fact, made with liver! Couldn't you have waited until I shook off this mortal coil (no doubt with a massive MI) for that info. LOL
Just enjoy it. Liver is good for us, in moderation -- B vitamins, protein. I can't stand the stuff, but Braunschweiger makes it delicious. So much the better with mayo and red onions.
Btw, I had reason to check the Mayo Clinic web site the other day. It can be found at www.mayoclinic.com. www.mayo.edu is also the Mayo Clinic. However, www.mayo.com is Hellmann's :-)