Get off the cable car to the trail of the crater, and go to the innermost, you can see a jade tea house. This is the most famous black jade in takungu, in fact, is to put ordinary eggs into a small basket, put into the geothermal pool, with natural sulfur water cooked, eggshell will slowly become pure black. Five bags of 500 yen, with a small bag of salt, it is a pity that we only saw it until the end, and we have always eaten good.