There is this IMHO very interesting solution from India that uses edible cutlery products. It’s basically a form of hard baked bread in the shape of knives, forks, spoons, plates, bowls, … . They keep hot and liquid food very well for quite some time, and the forks, knives and spoons remain solid enough to eat perfectly well with. Eventually, they will disintegrate on their own within a few weeks or so if you don’t eat them first. All this without the need to cover the surfaces with anything at all, and also made so cheaply that they come very close to most current disposable solutions.