I don't know how easy it is to clean wooden platters, but they're entirely traditional. A square meal was originally one which filled a square wooden platter to the corners.
.......A Square MEal was indeed a wooden plate used on board ships - and they had a wooden rim around the edge about 1cm high called a fiddle - if the food touched or was over this - you were said to be "on the fiddle" - ie: taking more than you should and you could be punished! We have one at work!
