The first thing I noticed was the smell. Sweet, smoky, slightly caramelized. Then I saw the source: a black drum oven on a Seoul street corner, with a wooden door and an old man tending the fire. Inside, layers of sweet potatoes were slowly roasting, their skins blackening, their insides turning into golden, sticky honey.
This is Gun-goguma(군고구마) — Korean roasted sweet potato. The simplest, oldest, most honest winter street food. No sauce, no seasoning, no fancy preparation. Just a sweet potato and patience.
How It’s Made
Whole sweet potatoes are slow-roasted in a drum oven (a converted oil drum) over hot coals. The slow heat caramelizes the natural sugars, turning the inside into something almost custard-like. About 120-150 kcal per medium potato. Pure, natural sweetness — no added sugar needed.
Did You Know?
Korean roasted sweet potato vendors used to be everywhere in winter, but they’re becoming rare. The drum oven is a vanishing tradition — most modern stalls use electric ovens now. If you see an old-school drum oven in Seoul, stop and buy one. You’re witnessing the end of an era.
Where & Price
Street corners, traditional markets, subway exits — anywhere in winter. Price: 1,000-3,000 KRW ($0.75-$2.25) depending on size. Bonus: you can put it in your pocket as a hand warmer before eating.
Pure, Honest Winter
Some street foods are flashy. Tornado potatoes, cheese hot dogs, glazed chicken skewers. Gun-goguma is the opposite — it’s quiet, humble, ancient. Just a sweet potato, slowly roasted until it becomes almost magical. In a world of food trends, gun-goguma reminds us that sometimes the simplest things are the best things. Find an old man with a drum oven this winter. You’ll thank me.
