looks like the Tatung is a double boiler: heat -> steel -> water -> steel -> food https://en.wikipedia.org/wiki/Bain-marie https://en.wikipedia.org/wiki/Bain

looks like the Tatung is a double boiler: heat -> steel -> water -> steel -> food https://en.wikipedia.org/wiki/Bain-marie https://en.wikipedia.org/wiki/Bain-marie