This is some weird hipster trend, isn't it? Sliced cheese on cold bread is about as common in Europe as obesity is in the states. Here's an example from Germany:
https://upload.wikimedia.org/wikipedia/commons/a/a0/AaIMG_9119_Bergk%C3%A4sbrot.jpg?utm_source=de.wikipedia.org&utm_campaign=imageinfo&ut...