@Mondobizarrro - Brain is GOOD. Very creamy. I used to have it in scrambled eggs.
@Mondobizarrro - Liver and onions never worked for me. I hated it and most any organ meats as they all have that same iron taste. I'm assuming it was popular cause it was cheap, and got a taste for it after a while.
It was cheap and that was it. You made do with what was easily available and offal prolly fell off when people realized ground meat similarly priced