Natural form

A whole Taiwanese flat cabbage head showing its distinctive flattened, wide shape.

The defining visual trait of this ingredient is its unusually flat, broad head — distinct from round cabbage — which readers must learn to recognize at a market.

Produce

Taiwanese Flat Cabbage

Sweet, tender flat-headed cabbage prized for quick stir-fries.

Taiwanese flat cabbage (gaoli cai) is a loose, flattened head cabbage with thin, tender, sweet leaves. It is a stir-fry staple in Taiwanese cooking, cooked quickly with garlic so the leaves stay crisp and sweet. It is more delicate and less peppery than common round cabbage.

Taiwanese flat cabbage—known locally as qingjiang cai and sometimes called Shanghai bok choy in English—is a loose-headed member of the Brassica rapa family prized for its distinctly flattened, pale green stems and tender dark green leaves. Unlike napa cabbage, which forms tight cylindrical heads, Taiwanese flat cabbage is harvested young, giving it a characteristic sweetness free of fibrous bitterness. The stems grow 1–2 cm wide and 15–25 cm long, reaching a total plant height of 20–30 cm, and are notably flatter and wider than standard bok choy varieties. It is a year-round market staple in Taiwan, where heat-tolerant cultivars allow continuous production, though peak quality arrives in the cool months from November through March. The crop thrives in paddy fields and is typically harvested when stems reach pencil- to small-finger thickness. In the kitchen, its structural advantage over rounder bok choy varieties is even cooking: the flat cross-section heats through uniformly, making it exceptionally suited to quick stir-frying where stems and leaves require only slightly different timing.

Measured in: piece
Storage: Fridge

Types & varieties

High-stem Qingjiang

Most common commercial variety in Taiwan; thicker, crunchier stems with excellent heat tolerance for year-round production

Round-stem Qingjiang

More common in mainland Chinese markets; slightly rounder stem cross-section and marginally sweeter

Taiwan-selected Cultivars

F1 hybrids developed for disease resistance and bolt tolerance in Taiwan's warm, humid climate

How Taiwanese Flat Cabbage Differs from Other Bok Choy Varieties

The defining trait is stem shape. Taiwanese flat cabbage produces broad, flattened stems while standard bok choy varieties have round or cylindrical stems. This flat geometry means heat penetrates more evenly during cooking, reducing the risk of undercooked crunchy cores. Taiwanese varieties also tend toward darker green leaves with a more tender texture compared to standard bok choy, which can have thicker, coarser leaf tissue. Unlike napa cabbage, which forms dense cylindrical heads suited for shredding and pickling, flat cabbage remains loose-leaved and is always harvested young, contributing to its lower fiber content and sweeter, more delicate flavor. In Taiwanese markets, it is sold loose or bundled with the roots intact, signaling freshness—avoid heads sold with roots already removed, as this accelerates wilting.

Flat stems → more even heat penetration → better for quick wok cooking
Dark green tender leaves → more delicate than standard bok choy
Loose-headed, harvested young → sweeter, less fibrous than napa cabbage
Root-on bundles indicate better freshness and shelf life

Washing Technique

Grit collects between the stem layers, making thorough washing essential. Hold the cabbage base-up under cold running water and gently spread the layers apart with your fingers, allowing water to flush out any trapped soil. Do not submerge the cabbage in a basin of still water—grit simply redistributes rather than washes away. After washing, shake off excess moisture and pat completely dry with clean towels or a salad spinner if you intend to stir-fry. Residual surface water causes steaming instead of searing, producing a limp, gray vegetable rather than the bright green, lightly charred result you want.

Hold base-up under running water and spread layers apart
Never soak in still water—grit adheres to inner surfaces
Dry thoroughly before stir-frying to achieve proper sear

Common uses

Quick stir-frying with garlic and sesame oil as a side dishAdding to hot pot (shabu-shabu) where the tender leaves cook in secondsServing raw in salads or as pickled Taiwanese preserved cabbageIncorporating into noodle soups and congee for a fresh green elementStuffing stems with meat or fish paste for classic dim sum preparationsBlanching briefly and finishing with oyster sauce as a simple vegetable courseAdding to stir-fried rice cakes (nian gao) for textural contrastWok-frying with fermented bean curd for a bold, savory preparation

Tips & pitfalls

Select heads with bright green leaves and firm, pale white stems; avoid yellowing or wilted outer leaves
Wash thoroughly between the stem layers where soil and grit collect—hold stems base-up under running water
Cut stems and leaves together but add stems 30–60 seconds earlier when stir-frying to ensure even cooking
Never overcook; the cabbage should retain a slight snap when pressed with chopsticks or a fork
Pat completely dry after washing if stir-frying to prevent steaming instead of searing
Separate stems from leaves only when the recipe requires different cooking times; keeping them intact preserves moisture
When buying, look for roots still attached—roots intact indicate fresher, less stressed produce
Use high heat and a hot wok; low heat causes the leaves to wilt unevenly and lose their bright color

Nutrition

25kcal

Energy

105 kJ · per 100 g

Where the calories come from

Protein 18%Carbs 79%Fat 3%

Protein

1.3g

3% DV

Carbs

5.8g

2% DV

Fat

0.1g

0% DV

Fiber

2.5g

9% DV

Sugars

3.2g

of which

Sodium

18mg

1% DV

Notable micronutrients

Vitamin K63% DV

Vitamin C41% DV

Folate11% DV

Vitamin B67% DV

Thiamin (B1)5% DV

Potassium4% DV

Source · USDA FoodData Central · Cabbage, raw

View on FDC →

In the shops

Matched grocery products

Red Cabbage
860 g · Mercadona
€1.72
Smooth Cabbage
890 g · Mercadona
€1.60
Curly Cabbage
920 g · Mercadona
€1.70
Half Red Cabbage
450 g · Mercadona
€0.95
Half Curly Cabbage
796 g · Mercadona
€1.75
Half Smooth Cabbage
900 g · Mercadona
€1.94

Good to know

Also Called: Shanghai bok choy, qingjiang cai, flat-stem bok choy
Scientific Name: Brassica rapa subsp. chinensis or related Brassica rapa cultivar
Origin: Southern China and Taiwan; extensively cultivated in Taiwanese agriculture
Growing Season: Cool weather crop; peak harvest November–March; heat-tolerant varieties allow year-round supply
Typical Size: Stems 1–2 cm wide, 15–25 cm long; whole plant reaches 20–30 cm at harvest
Plant Characteristics: Loose-headed; slender, flattened pale green stems; dark green tender leaves; nearly 100% edible with only the root end removed
Flavor Profile: Mildly sweet with subtle brassica bitterness and delicate mineral notes from soil
Key Nutrients: High in vitamin C, vitamin K, folate, and dietary fiber
Storage: Refrigerate unwashed in a plastic bag; use within 3–5 days for best texture; does not freeze well

Substitutes

Regular Bok Choy — Works in all applications; stems are rounder and may require 15–30 seconds longer cooking time for even doneness
Baby Bok Choy — Substitute 1:1 in hot pot or blanching; stems cook similarly but heads are smaller and may need more handling
Napa Cabbage Leaves — Better for wrapping or soups; too bulky for quick stir-fry applications where the stems are used

Pairs with

Garlic Sesame Oil Oyster Sauce Pork Belly Dried Shrimp GingerShiitake MushroomsTaiwanese Rice Wine (Mijiu)

Also called

高麗菜 · Gaoli Cai · Flat Cabbage