This is a convenient "nabo-shi" (pot hat) that allows you to enjoy simmered dishes without using fire. Instead of simmering over a low flame, you can cook stews by using the heat retention of the pot without using fire. After simmering on the stovetop, remove the hot pot from the heat and place it inside the "nabu-ton" (pot futon), and your stew will be ready in a few hours. If you prepare it in the morning, you can have a simmered dish for dinner when you come home from work. You can cook without using fire as much as possible, which will save on electricity and gas bills. I liked using it so much that I made it to give as a present to my daughter and son's families. Here you go! This is handmade by an amateur, so please understand this before purchasing. [Category] Other Cooking Utensils [Condition] New [Color] Blue