A worker uses firewood in a furnace to smoke the boiled fillets of katsuo (skipjack tuna), at the Takeuchi Ltd katsuobushi factory in Usa Town, Tosa, Kochi Prefecture, Japan, May 12, 2022. Katsuobushi (smoke-dried katsuo) is essential to Japanese cuisine, but the number of its manufacturers in Kochi has plunged in forty years from dozens to only a few. "I'm really unsure if we can continue this," said managing director Taichi Takeuchi, 36. REUTERS/Kim Kyung-Hoon
