After moving to Copenhagen, I was quite amazed to see the sandwiches served here ,were 'open'. Open, in the sense, just one slice of bread with the cheese, butter, or meat. This is known as smørrebrød in Danish.
You can't go far in Denmark without noticing the beautifully decorated open-faced sandwiches!! The best thing was when we had ordered for a sandwich at a restraint, we were quite surprised to see the other slice of bread...