Gun Goguma (Korean Roasted Sweet Potatoes)
Korean winter street food at home: whole sweet potatoes roasted slow then hot until the skin wrinkles and dark syrup leaks onto the pan. Two ingredients.
Servings 4 servings
Ingredients
For the Roasted Sweet Potatoes
- 4 medium Korean sweet potatoes (goguma) about 2 pounds total, similar in size
- 1 pinch flaky sea salt optional, to finish
Instructions
Roast Slow, Then Hot
- Scrub the sweet potatoes under cold water and dry them well. Do not peel, do not oil, and do not pierce them.
- Line a sheet pan with foil and set the potatoes on it with space between them. Slide the pan into a cold oven, then set the oven to 300F and roast for 40 minutes.
- For a softer, moister interior, wrap each potato loosely in foil for this low phase only.
- Raise the oven to 425F, unwrap any foil, and roast another 25 to 30 minutes.
Check and Rest
- Look for dark sticky beads of syrup leaked onto the pan, a visibly wrinkled loose skin, and flesh that gives completely under gentle pressure. If there is no syrup, give it another 10 minutes.
- Rest 10 minutes before eating. Tear open and eat from the skin, with flaky salt if you like.
Stovetop Method
- Put the scrubbed potatoes in a heavy pot or Dutch oven with a tight lid and no water. Cook over low heat, covered, turning every 10 minutes for 45 to 55 minutes, until the skin is scorched in patches and the potato is soft through.
Notes
- Start in a cold oven: the slow climb keeps the potato in the 135F to 170F range where its own enzymes turn starch into sugar. This is the whole difference between starchy and syrupy.
- Do not pierce them: holes let the syrup escape before it can caramelize.
- Read the syrup, not the clock: dark sticky beads on the pan and a wrinkled loose skin mean done.
- Variety matters: Korean goguma has purple skin and pale ivory flesh. Japanese satsumaimo behaves the same. Orange American sweet potatoes are wetter and less sweet.
- Eat it cold: a chilled roasted goguma has a firm, fudgy texture that many Koreans prefer to the hot version.