sam2: first of all ???? ??? would presumably make them hot, as the steam is rising from the bottom. Anyways, a liquid heated for more than a minute or so DOES make the roof of a microwave hot. Try it.
I agree, as ROB mentioned on a previous thread, if you only heat covered or very dry foods, you may not have a problem.Furthermoree, if the Zeia is hot, it absorbs even if the surface is not.