This is a simple, at-home sweet potato roaster that allows you to easily make delicious baked sweet potatoes. Simply set the included stones in the main body and add your ingredients to enjoy authentic stone-baked cooking of sweet potatoes, potatoes, corn, and more. I purchased this item from a shop a few years ago. I took it out of the box intending to use it, but it's unused. I have disposed of the box and instruction manual, so I've listed it as "Like New." ~~~ Quoted from the product page below ~~~ The far-infrared rays emitted from the stones bake the entire ingredient evenly and slowly. Because you bake the ingredients whole, you don't lose any of their nutrients, and you can enjoy them deliciously. By baking while retaining the ingredients' moisture, you bring out the flavor and sweetness, resulting in a fluffy finish. The Yokkaichi Banko-yaki heat-resistant ceramic ware uses a special clay mixed with petalite, making it highly heat-resistant and durable, without cracking even over direct flames. It also excels in heat retention and moisture retention. The far-infrared effect and the gentle heat conduction of the ceramic ware slowly and gradually heat the ingredients, resulting in a delicious finish. Guide to making baked sweet potatoes and roasted chestnuts Guide to making baked sweet potatoes 1. Spread a thin layer of stones on the bottom of the earthenware pot, and place the sweet potatoes on top. If they are large, cut them to fit. 2. Heat over high heat, turning them over several times, for about 30 minutes. If you can pierce them with a skewer, they are done. ※ You can also bake potatoes, corn, eggplant, etc., using the same method. Guide to making roasted chestnuts 1. Spread a thin layer of stones on the bottom of the earthenware pot and heat over high heat. 2. Once the stones are hot, add the chestnuts with slits and heat them as is. Stir the chestnuts every 5 minutes or so and bake for about 20 minutes. ※ Please make slits in the chestnuts beforehand. They may pop. By baking while retaining the ingredients' moisture, you bring out the flavor and sweetness, resulting in a fluffy finish. Black, round earthenware pot, with a white interior and small stones. Please refer to the product page URL. https://item.rakuten.co.jp/cooking-clocca/n-sahanki-01000018/ There are no major chips or cracks, but as this is a personal inspection, please purchase only if you understand that it is a used item and vintage item. Please refrain from purchasing if you are sensitive to such things. Thank you for looking.