In the past several years I've discovered that I have quite a few food allergies (or sensitivities, not sure) that I didn't used to. I've known about tree nuts for a while, though it took a while to figure out some of the other stuff. It seems I'm allergic to just about everything in the
Rosaceae family. Raspberries and apples were the first I clued in on, but also blackberries, strawberries, peaches, cherries, and roses (including vitamin C from rose hips), among others. I'm not sure when this started, because a decade ago I was eating an apple almost every morning for breakfast and doing great.
Why do I bring this up? Because I basically can't have any jelly/jam anymore; the pectin is almost always from apples, even if the flavor is a fruit I'm not allergic to (like blueberry). So I've been experimenting with other things to have with peanut butter in a sandwich. Honey is out since I'm allergic to so many different trees and flowers. Date syrup is very good, and marshmallow fluff is decent, but today's experiment is much better than either, IMO: cream cheese frosting and peanut butter sandwiches are delicious (if rather indulgent).