For me it was salmon patties. My parents were fond of making them, especially during Lent. It was basically a can of salmon, toss in some (light) seasoning, and cook until its the consistency of a hockey puck. They were these dry, tasteless abominations and I could not stand them.
If I were to make them today, it’d be more akin to a crab cake and with fresh salmon instead of canned. But I won’t.