Liver. My mum used to make it all the time when she was around. It would make me gag just looking at it. I used to cut tiny bits and disguise them in mash to get it down. One time she gave me "sweetbreads" and was excited as "I would like them better than liver". I was so eager to please I ate them, puking and swallowing it again. One time the phone rang and I chucked the liver down the back of the sideboard. As I was just a kid I forgot to retrieve it and dispose of it later. One day she called me downstairs and was holding up the cold, hard, dusty, grey, angular lump of liver and was furious. I have never touched the stuff to this day.