Tsubo-yaki Imo no Kumasan, Hiroshima’s Slow-Roasted Sweet Potatoes

Field notes

Each potato is suspended above Binchotan charcoal inside a ceramic pot, allowing circulating heat and radiant heat to cook it without direct flame for more than two hours. After inspection, the potatoes are vacuum-packed and frozen rather than sold only at the moment of roasting. The operation lists seasonal varieties, four product categories, an Ujina sales booth, and wholesale distribution to locations including a spa and a roadside station.