History
During the Middle Ages, thick slabs of coarse bread called "tranches" (late 15th century French) or, in its English derivative, "trenchers", were used as plates. At the end of the meal, the food-soaked trencher was eaten by the diner (from which we get the expression "trencherman"), or perhaps fed to a dog or saved for beggars. Trenchers were as much the harbingers of open-face sandwiches as they were of disposable dishware.
As such, open-face sandwiches have a unique origin and history, differing from that of the true (multi-slice) sandwich.
Read more about this topic: Open Sandwich
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