My dad would sometimes tossed stuff together, usually my mom cooked. He would put simple stuff together, often in a sandwich, that he thought tasted good. As a kid I learned from him, I adored my dad, still do his memory. And he sure came up with some good combos, but a lot of them were what, I guess, most folks would think were odd.
Cannot come up with recipes because the stuff was done off the cuff, from what we had in the fridge and pantry.
Actually, with thanks to your BF, a sausage - not an Italian one - with jelly does not sound all that strange to me. I would probably have used some 'maple' syrup instead, just my preference.
A favorite sandwich, which I have adapted from childhood memories, is toast, peanut butter mixed with Worcestershire sauce, and onions. I no longer butter the toast, but it adds a dimension.
Always have canned anchovies and sardines on hand.
I don't know is that is odd, but it is the way I am.