My DBIL was born in Norway and really likes his heritage dishes to eat. This is his favorite lunch or snack. He uses all kinds of breads...except what he calls (American) Air Bread. When I have visited it appears his preference is Pumpernickel and Sourdough. My sister says that when they go to Norway to visit DBIL's lifelong friend...that the friend's wife serves these open-faced sandwiches all day long. Any kind of meat and cheese can be used...I'm simply mentioning those which my DBIL seems to eat the most often. At Norwegian parties I have attended the 'open faced' sandwiches were premade with various meats and cheeses and stacked beautifully on a large platter.