I once read of a woman so fed up with her husband's moans about the sandwiches she kindly made him that the next time she put plain cooked rice in between two slices of unbuttered white bread. Pretty inspired as an example of the worst sandwich filling.
Bread, no spread and cress. It’s what we were given on a school outing when I was 6. Not surprisingly I wouldn’t eat it. They called my older brother off the other coach but I still wouldn’t eat it. I was a fussy eater they said!