🍂Autumn

Sweet Potato

고구마Goguma

Ipomoea batatas

Sweet potatoes (goguma) arrived in Korea from Japan in 1763, when Joseon Dynasty official Jo Eom brought them from Tsushima island during a diplomatic mission, recognizing their potential to alleviate famine. The Donguibogam, written before sweet potatoes reached Korea, does not include them, but later Korean medical texts classify goguma as neutral-warm in nature and sweet in flavor, noting they tonify the spleen and benefit qi. Sweet potatoes quickly became a survival crop that saved countless lives during food shortages. Today, goguma occupies a uniquely beloved place in Korean food culture — roasted sweet potatoes (gun-goguma) from street vendors are one of Korea's most nostalgic winter comfort foods, and goguma-latte and goguma-flavored snacks are enormously popular. Korea favors varieties with deep purple skin and yellow-to-orange flesh that become intensely sweet and creamy when roasted.

New to Sweet Potato?

Is this edible?

Yes! Sweet potatoes are one of Korea's most beloved comfort foods, roasted from street vendor carts in winter or used in desserts, side dishes, and even lattes. Koreans eat sweet potatoes far more frequently than Americans do.

What does it taste like?

Korean sweet potatoes (especially the popular 'honey' variety, 꿀고구마) are denser, drier, and sweeter than American orange sweet potatoes — more like a roasted chestnut than a mushy yam. Japanese sweet potatoes are the closest Western market equivalent.

Where to buy

Korean or Asian grocery stores carry authentic Korean varieties with purple skin and yellow-to-orange flesh. Japanese sweet potatoes (purple skin, white/yellow flesh) at Asian stores or Trader Joe's are a great substitute. Regular American sweet potatoes work but are much moister.

How to prepare

Scrub well but do not peel. For roasting: bake whole at 200C/400F for 45-60 minutes. For goguma-mattang (candied sweet potato): peel, cut into chunks, fry, and coat in caramelized sugar.

Pro tip: Slow-roasting at a lower temperature (160C/325F) for longer (90 minutes) dramatically increases sweetness by giving the enzymes more time to convert starch to sugar. This is the secret of Korean street vendor sweet potatoes.

Traditional Medicine

Source: Donguibogam

Nature (性)

Neutral (平)

Flavor (味)

sweet

Target Organs (歸經)

Spleen (脾), Kidney (腎)

Benefits

digestion
Strengthens the spleen-stomach and boosts energy
비위를 보하고 기력을 돋운다
Source: Donguibogam

Key Compounds

Beta-caroteneDietary fiberVitamin CPotassium

This information is based on traditional Korean medicine texts (Donguibogam) and is for cultural reference only. It does not constitute medical advice.

Seasonal Availability

🍂AutumnAvailable year-round

Harvested in autumn; sweetness increases after a few weeks of curing in cool storage.

Culinary Profile

Flavor

Naturally sweet, starchy, creamy when cooked

Texture

Dense and fluffy when steamed; crispy when fried

Common Uses

Roasted/steamed snackGoguma-mattang (candied)Desserts and lattes

Western Substitutes

Japanese sweet potatoGarnet yam

Sweet Potato

New to Sweet Potato?

Traditional Medicine

Benefits

Key Compounds

Seasonal Availability

Culinary Profile

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