Jigoku-mushi is a cooking method using steam from hot springs which is popular in Beppu, a hot spring town in Kyushu. It does not use gas or electrify, but 100% geothermal energy so very environmental friendly. Meat, egg and vegetables are typically cooked this way but this place also steams custard pudding (similar to creme caramel or flan) using the hot springs steam.
by BocaTaberu