Simple oven-roasted Korean sweet potatoes with a sesame-soy drizzle, sweet and satisfying.
Goguma, Korean sweet potatoes, have a drier, denser, and notably sweeter flesh than Western varieties once roasted, making them a beloved snack and side dish across Korea, especially in colder months when roasted sweet potato carts are a common street sight. This version roasts them whole until caramelized, then finishes with a simple sesame-soy drizzle. Roasting low and slow, rather than blasting high heat, is what allows the natural sugars in the sweet potato to fully caramelize, turning the flesh almost custard-like and intensely sweet by the time it's done.
Serves 4
Preheat oven to 180°C (350°F).
Scrub the sweet potatoes clean and pierce each a few times with a fork.
Place directly on the oven rack or a baking sheet and roast for 55-65 minutes until completely soft and caramelized, with syrup possibly leaking from the ends.
Lower, slower roasting develops much more sweetness than a quick high-heat bake.
Whisk sesame oil, soy sauce, and honey together in a small bowl.
Split each roasted sweet potato open, drizzle with the sesame-soy mixture, and top with sesame seeds and scallion if using.
Serve immediately while still warm.
Roast at a lower temperature for longer, rather than a quick high-heat bake — this develops much deeper natural sweetness.
Choose sweet potatoes of similar size so they finish roasting at the same time.
Place a tray or foil underneath to catch any syrup that leaks out during roasting.
Top with a scoop of vanilla ice cream for a dessert-style version, popular as a modern twist.
Cube the roasted sweet potato and toss with the sesame-soy dressing for a salad-style presentation.
Add a sprinkle of cinnamon for extra warmth.
Refrigerate for up to 4 days; reheat in the oven or microwave until warmed through, though the texture is best enjoyed fresh.
Roasted sweet potatoes are a beloved cold-weather street food across Korea, traditionally sold from oil-drum roasters (gungoguma) on winter streets, and remain a nostalgic comfort food for many Koreans.
Goguma tend to have a drier, denser texture and become intensely sweet when roasted, compared to the moister, less sweet flesh of many Western sweet potato varieties.
Microwaving is much faster but won't develop the same deep caramelized sweetness that slow oven roasting achieves.
This is completely normal and a sign the natural sugars are properly caramelizing during the long roast — it's not a problem.
Per serving (220g / 7.8 oz) · 4 servings total
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