Natural form

Fresh oca tubers in their natural knobbly state, showing the vivid color range of Andean varieties.

Shows readers the distinctive knobbled surface texture and range of colors (yellow, orange, red, purple) that make oca immediately recognizable.

Produce

Oca

Andean tuber with crunchy, tangy flesh eaten roasted, boiled, or raw.

Oca is a knobbly Andean tuber, second only to the potato in the highlands of Peru and Bolivia. The colorful tubers have a crisp texture and a lemony tang when raw that mellows to sweet when cooked; they are boiled, roasted, or sun-dried. Leaving them in the sun increases their sweetness.

Oca (Oxalis tuberosa) is one of the Lost Crops of the Incas, a tuber domesticated in the Andean highlands of Peru and Bolivia long before European contact. Unlike potatoes, which it accompanies in traditional highland cultivation, oca has never achieved global prominence—yet it deserves wider recognition for its remarkable versatility and distinctive flavor. The tubers, typically 5–15 cm long, have firm, crisp flesh that behaves differently depending on preparation: raw slices deliver a bright, tangy crunch with a distinct citrusy character; cooking transforms the flesh into something creamy and starchy with caramelized, earthy sweetness when roasted. The plant produces 5–15 tubers per plant and comes in a striking array of skin colors—yellow, orange, pink, red, and purple—though the flesh ranges primarily from yellow to orange, with occasional pink or cream tones. Both the tubers and young leaves are edible, the latter prepared much like sorrel. Its moderate oxalic acid content gives oca that characteristic sour note, though traditional Andean processing (exposing harvested tubers to sunlight for several days to develop sweetness) significantly reduces this tartness.

Measured in: g
Storage: Pantry

Types & varieties

Yellow Oca

Most common commercial variety; bright yellow skin and flesh, mild sweetness when cooked

Red Oca

Pink to red skin with cream to yellow flesh; slightly more acidic raw than other varieties

Purple Oca

Purple-skinned with purple-tinged flesh; more starchy with a nuttier, more complex flavor

Orange Oca

Deep orange skin and flesh throughout; often the sweetest when roasted, mildest raw tartness

White/Cream Oca

Paler varieties with white to cream flesh; mildest, most delicate flavor profile

Common uses

Raw in salads, sliced thin for crunchy texture and bright, citrusy tang that lifts composed dishesRoasted until caramelized, served as a hearty vegetable side with richer proteinsBoiled or steamed until tender, then mashed as a starchy side dish similar to potatoesBaked whole, similar to small potatoes, possibly stuffed or topped with butter and herbsAdded to Andean stews and soups in the last 15 minutes of cooking to hold shapePickled, a traditional preservation method in Peru and Bolivia that mellows the tangGround into flour for traditional breads, pancakes, and gluten-free applicationsLeaves and young shoots sautéed or added to soups, prepared exactly like sorrelIn New Zealand cuisine: boiled and served with roasted meats or layered into gratins

Tips & pitfalls

Taste a small piece raw before committing to a preparation—flavor varies dramatically by variety and maturity, from mildly tangy to aggressively sour
Do not peel unless the recipe requires it; a thorough scrub with a vegetable brush preserves nutrients and texture
For roasting, toss whole or halved tubers with oil, salt, and aromatics, then roast at 200°C (400°F) for 30–40 minutes until caramelized and tender throughout
When boiling, start in cold salted water and cook just until tender, 15–20 minutes; overcooking makes them watery and bland
To reduce oxalic tang before cooking, blanch whole tubers in boiling water for 1–2 minutes, then drain and proceed with your recipe
Store oca away from apples and pears—these fruits emit ethylene gas that causes sprouting in root vegetables
If the raw flavor is too sour, seek out orange or yellow varieties; red varieties typically have the most pronounced acidity
The leaves cook in only 2–3 minutes; add them to soups or sautéed dishes at the very end to prevent mushiness
Do not confuse oca with yacon—yacon has apple-sweet flesh and is primarily eaten raw, while oca is more starchy and far more versatile cooked

Nutrition

118kcal

Energy

494 kJ · per 100 g

Where the calories come from

Protein 5%Carbs 94%Fat 1%

Protein

1.5g

3% DV

Carbs

27.9g

10% DV

Fat

0.2g

0% DV

Fiber

4.1g

15% DV

Sugars

0.5g

of which

Sodium

9mg

0% DV

Notable micronutrients

Vitamin C19% DV

Vitamin B617% DV

Potassium17% DV

Thiamin (B1)9% DV

Folate6% DV

Magnesium5% DV

Source · USDA FoodData Central · approx. Yam, raw

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In the shops

Matched grocery products

No matched grocery products for Oca yet.

Good to know

Scientific Name: Oxalis tuberosa
Origin: Andes mountains of Peru and Bolivia, cultivated since pre-Columbian times
Primary Regions: Peru, Bolivia, Ecuador, Colombia; New Zealand (called New Zealand yam)
Harvest Season: April–May in the southern hemisphere, after potatoes
Flesh Color: Yellow to orange; sometimes pink or cream
Raw Flavor: Tangy, citrusy, mildly sour from oxalic acid
Cooked Flavor: Sweeter, earthier; roasting caramelizes natural sugars
Key Nutrients: Good source of vitamin C and potassium
Storage: Cool, dark, dry place; keeps several months
Oxalate Note: Contains oxalic acid; moderate consumption advised for those prone to kidney stones

Substitutes

Yacon — Milder, sweeter Andean tuber; works in salads and as a cooked side; significantly less tangy than oca
Sunchoke (Jerusalem Artichoke) — Similar crunchy texture when raw, nutty flavor; comparable in salads and roasted preparations
Sweet Potato — Best for roasted or mashed preparations; lacks oca's tang but delivers similar creamy cooked texture
Fingerling Potato — Closest cooked substitute for boiled or roasted dishes; add lemon or lime juice to approximate oca's brightness
Turnip — Similar peppery edge when raw; acceptable in salads; becomes sweet and mild when cooked