Tuna sandwiches are yummyyyy! But too bad it has left a scar in Mr. K's memories of it. Although I would think that it would have made you appreciate it more since it helped him through life? Sometimes in movies, the character who became well to do, would look for the very simple foods or things that they grew up with as someone who was poor. Is this the same Mr. K as your previous story, the ex soldier artist?
The truth is, the tuna sandwich thing happened to me, haha...Let's just say that eating so much tuna made me develop a certain aversion. In fact, I only recently started eating tuna again after a 20-year Avoiding it!
Mr. K is a character I borrowed from Kafka. It's not always the same character, but he's usually the protagonist of my writings, hehe.