In medival times plates and platters were used only to serve food. Folks, at banquets, eat off of bread plates called trenchers. The guests did not eat these, though. They were given to the poor after the banquets. Also the people of highest honor at a banquet were given the top and bottom slices since they had a crust that would all foods from soaking through and making a mess. Thus the term "upper crust" used when talking about the rich or elite of society.