[steamer25]

It doesn't work for really wet foods like soup but I've been using wooden plates for e.g., microwave burritos. Since wood has a low dielectric loss, it's highly transparent to microwaves and therefore steals less energy away from heating the food than e.g., ceramic.

I'm not sure about the toxicity of various wood sealers. I've been using butcher-block sealer which has e.g., bee's wax but also some more questionable substances. I'm interested in trying shellac but it's not overly cheap.