[1] In China, yellow-fleshed sweet potatoes are roasted in a large iron drum and sold as street food during winter.
[2] They are called kǎo-báishǔ (烤白薯; "roasted sweet potato") in northern China, wui faan syu (煨番薯) in Cantonese-speaking regions, and kǎo-dìguā (烤地瓜) in Taiwan and Northeast China, as the name of sweet potatoes themselves varies across the sinophone world.
Sweet potatoes roasted in drum cans, called gun-goguma (군고구마), are popular in both North and South Korea.
[7] In Japan, a similar street food is called ishi yaki-imo (石焼き芋; "roasted sweet potato in heat stones") and sold from trucks during the winter.
[8] Roasted sweet potato (khoai lang nướng) is a popular winter street food in Hanoi and Northern Vietnam.