Turnip (Sunmu)

Brassica rapa

Glucosinolates with a peppery bite, prized for digestion in Korean tradition

The turnip (sunmu) is a brassica root vegetable known in traditional Korean medicine as mancheong (蔓菁), where the Donguibogam, the classic 17th-century medical text, described it as opening the stomach to help break down food and benefit the five viscera. Kanghwa Island turnips are especially famous, and their sharp, slightly pungent flavor comes from glucosinolates (mustard-oil glycosides), the same compounds found in radishes and mustard greens. Every part is eaten across the seasons: tender shoots in spring, leaves in summer, and roots in fall, most often as kimchi or fresh seasoned salads. The Donguibogam also noted that eating the seeds (mancheongja) over time was said to brighten the eyes.

Year-Round Calendar

Sowing

Harvest

Health Benefits

Digestion and the five viscera (traditional). In Korean tradition, mancheong (turnip) was a food-medicine used to open the stomach, aid digestion, and benefit the five viscera, and was applied for jaundice and overindulgence in alcohol.

Brassica compounds (preliminary). The antioxidant and detoxifying actions of brassica compounds such as glucosinolates are often cited, though most of the supporting evidence remains at a preliminary stage.

Nutrition

Glucosinolates (Brassica mustard-oil glycosides) — Pungent flavor; antioxidant (suggested)
Vitamin C and dietary fiber (Found in both root and leaves) — Antioxidant; gut health

Pairings

○ Kimchi and seokbakji — Sunmu-kimchi made from Kanghwa turnips has a sharp, refreshing taste that is distinct from the milder flavor of regular radish kimchi.

○ Salt-cured and fresh salads — Sliced thin and lightly cured in salt, or tossed raw as a seasoned salad (saengchae), the turnip offers a crisp texture and a pleasantly pungent bite.

○ Soups and braises — Added to soups or braises, much like a radish in mutguk (radish soup), it lends a gentle, subtle sweetness as it cooks.

Source: Rural Development Administration (Nongsaro) · Donguibogam (Principles and Practice of Eastern Medicine)