This was Germany’s 70/80th party food. I remember when my older sisters had house parties, and these easy toast with ham, pineapple and cheese open faced sandwiches were a hit.
These days I still make it occasionally for an easy evening snack or Brotzeit. My daughter introduced her American husband to it, and he loved these exotic open faced sandwiches. You can use Texas toast, instead regular. Or Bake your own Bread