This handsome object is a wooden plate known as a trencher. Apparently this form of medieval tableware began, originally, as a crust of stale bread to put food on- and then given to the poor at the end of the meal.
Eventually the bread idea was phased out I suppose, because they started making trenchers from wood.
And then the poor ate... cake?
Anyway, I love the circle/ square design- Deiter Rams couldn't have done better.