Please only purchase if you understand that this is a used item, as it has been used once. Pottery sweet potato roasting pot made of "Banko-yaki," a specialty craft of Mie Prefecture. Besides sweet potatoes, you can also cook potatoes, taro, chestnuts, corn, ginkgo nuts, garlic, etc. ① Fill the bottom of the sweet potato roasting pot with the included natural stones that radiate far-infrared rays. ② Place the washed ingredients on top of the natural stones. Cut large potatoes so that the lid of the pot can close (up to about 200g). Also, pre-cut the shells of ginkgo nuts and chestnuts with scissors so they won't burst in the microwave. ③ Cover the pot with the lid and heat. The heating time for a 500W microwave is about 7 minutes for 100g of potatoes, about 8 minutes 30 seconds for 150g, and about 10 minutes for 200g. About 2 minutes for 5 ginkgo nuts, and about 4 minutes for 3 chestnuts. (If the potatoes are hard, insert a toothpick and add more heating time.) Note: The pot will be hot after cooking, so use oven mitts or pot holders to remove it from the microwave. Also, when placing the heated pot on a table, use a trivet or a heat-resistant mat. Do not use stones other than the included ones. Material: Heat-resistant pottery (Banko-yaki) Size: 12.5cm long x 21.5cm wide x 10.5cm high Total weight: 1,000g (including 300g of natural stones) Accessories: Natural stones that radiate far-infrared rays Country of origin: Japan Seller: Sentou Senga Pottery Co., Ltd. Material... Porcelain (Banko-yaki) No box, instruction manual included, natural stones included.