My mother loves her Chinese Seiro. When I went home the other day, she defrosted frozen sekihan (red bean rice) in the seiro. It contained just the right amount of moisture and tasted just like freshly cooked rice. Two servings are ready 15 minutes after boiling.

Yamaichi's Chinese Seiro
https://www.shokunin.com/en/yamaichi/seiro.html
Nakamura Douki's Steam Plate
https://www.shokunin.com/en/nakamuradouki/seiro.html