Sweet potatoes roasted in drum cans, called gun-goguma (군고구마; "roasted sweet potato"), are also popular in both North and SouthKorea. The food is sold from late autumn to winter by the vendors wearing ushanka, which is sometimes referred to as "roasted sweet potato vendor hat" or "roasted chestnut vendor hat". Although any type of goguma (sweet potato) can be roasted, softer, moist varieties such as hobak-goguma (pumpkin sweet potato) are preferred over firmer, floury varieties such as bam-goguma ("chestnut sweet potato") for roasting.
In South Korea, roasted sweet potatoes are dried to make gun-goguma-mallaengi (군고구마 말랭이), and frozen to make ice-gun-goguma (아이스 군고구마).
Although gun-goguma has traditionally been a winter food, gun-goguma ice cream and gun-goguma smoothie are nowadays enjoyed in summer.