My friend's mom used to make peanut butter and tomato sandwiches. Sliced tomato, some salt and peanut butter. I can remember thinking they were pretty good for a while, but after a few encounters, the thought started to kill my apetite.

This was in Illinois in the 70s, I never knew whether it was unique to that family, but I checked around and it's a thing:

https://www.clermontsun.com/2011/07/08/the-origin-of-the-tom...

http://mormonfoodie.blogspot.com/2011/04/peanut-butter-and-t...