I like PB sandos with a very thin scrape of Vegemite under it (for a slight saltiness) - I also like other nut butters - & I like cheese on top!

I have also been known to put gherkin or dill pickle on top, too.

Decades ago I used to buy a PB, banana, date & tahini sando from a vegetarian lunch shop. YUM! All I need is a banana, some dates & tahini to make it again. Just might do a spot of shopping tomorrow ...