I also loved peanut butter jelly sandwiches, while my (British) significant other enjoyed crisp sandwiches (eh?)
A British childhood classic
Take a small pile of slightly-crushed crisps (potato chips) and squish them, with raw sliced onions, between two generously buttered slices of (I quote) "the most unhealthy white bread you can find." Voila!
For non-Brits, I *totally* understand if this sounds crazy! :)
P.S. Classic crisp sandwich (key to a (British) man's heart?)...