Xialun Tuboshu Charcoal-Roasted Sweet Potatoes. Cai Youtian (born 1934) was a farmer who cut sweet potato vines (seedlings) to sell to other farmers for propagation. The Cai brothers did not want to follow in his footsteps. Cai Youtian (born 1934) was a farmer who cut sweet potato vines (seedlings) to sell to other farmers for propagation. The Cai brothers did not want to follow in his footsteps. The eldest, Cai Zhuncun (born 1964), went north to open a restaurant, while the second eldest, Cai Zhenxiong (born 1965), opened a supermarket locally in Kouhu. The restaurant's operations were poor and it eventually closed. Cai Zhuncun thought of the sweet potatoes from his childhood and began selling them at the Linjiang Traditional Market. The supply came from Cai Zhenxiong, who stayed in their hometown. The business was surprisingly good, but the profit margins were not high. After selling for a period, they switched to charcoal-roasted sweet potatoes, and this venture became a golden brand. "Tuboshu Charcoal-Roasted Sweet Potatoes" is a registered trademark. In addition to supplying his elder brother Cai Zhuncun with charcoal-roasted sweet potatoes, Cai Zhenxiong was also a supplier to over 10 charcoal-roasted sweet potato vendors in the north. In 2003, Cai Zhenxiong closed his supermarket business to focus on supplying sweet potatoes. He also began selling charcoal-roasted sweet potatoes himself. With his brother's consent, he also branded his stall "Tuboshu Charcoal-Roasted Sweet Potatoes" and made a name for himself in the Xialun area. Cai Zhenxiong's sweet potatoes come from two sources, primarily from Yunlin County, but in September and October... Address: 雲林縣口湖鄉下崙村中山路 31 號 Hours: 00:00–23:59 Yunlin