Nagatani-en
About as plastic-free as a cooking vessel gets, and not by marketing: the Kamado-san donabe is stovetop Iga clay with a double clay lid, no electronics, no coating, and no plastic anywhere. It's the "escape hatch" from the whole coated-appliance problem — heat-resistant earthenware that never needed a synthetic surface. Nagatani-en doesn't pitch this as plastic-free; it's simply how traditional donabe have always been made.
How clear are their specs?
Nothing to obscure — a single fired-clay material, visibly so, with no coatings, liners, or hidden components in the food path.
