I was a bit surprised to discover the whole jelly-jello language thing. I’d always assumed when people spoke of nailing jelly to a wall that they were talking about something jam-like, not jello-like. I’ve not done the experiments, but I would assume attempting the former would be much less successful.
They also got it wrong in their explanation. To Americans, jelly is jam with the fruit bits filtered out, leading to a homogeneous spread. Jam has crushed fruit, giving it a thicker, uneven texture, and preserves are whole-ass pieces of fruit boiled down in syrup. Marmalade is jam with citrus rinds. As listed here, they are sorted in descending desirability for inclusion in a peanut butter and jelly sandwich.
Surely you mean ascending!
Preserves > marmalade & jam > jelly
I want maximal fruit flavor for combination with my peanut butter.
Which makes me consider other options. Peanut butter and banana is a classic, ofc, but should I try even-more-concentrated fruits? Fruit jerky? Dried mangos? But then the texture would be weird; probably have to chop up the dried fruit, first. Or what about making a fruit-based tea, then using that as the water for making the bread?
Or, hell, we could subvert the entire PB&J structure. Use strawberry fruit jerky as the "bread", and PB + ... banana? as the filling. (Considered various "bread" fillings, like crushed Ritz crackers. I dunno, I'd try it. Strawberry jerky, with a little peanut butter and crushed ritz crackers in between)