Buy European

Heh, fair enough. I took a look at some pictures of US grocery sections at European stores and applied the huristic of:

• if it's there, it's not super popular.
• If I would buy it regularly, chances are a European would too, just not as many, see point one.
• if it's awful it's being sold as an amusing novelty.
• if I wouldn't buy it often but I recognize it's American it's a fun novelty or comfort food for the homesick.

Based on that metric, I concluded there was a contingent of Europeans who viewed American peanut butter, BBQ sauce and hot porridge as superior enough to justify spending extra on. That spray cheese was correctly regarded as a disgusting novelty, and that pop tarts, lucky charms and marshmallow fluff are noveltys that are "fine".

Wouldn't have expected you to put relish there though! I kinda figured that was one everyone had that they tweaked a little for regional taste, like mustard.