Stored

Sour pickled long beans sold in vacuum-sealed or jarred form, coiled and brine-soaked.

Shows readers the most common form they will encounter when purchasing — the fermented, brine-packed coils — so they can identify the ingredient at a store.

Produce

Sour Pickled Long Bean

Tangy fermented yardlong beans, chopped into Chinese stir-fries with minced pork and chili.

Sour pickled long beans are yardlong beans brine-fermented until they turn tangy, slightly funky, and crunchy. A staple of Sichuan and southern Chinese home cooking, they are finely chopped and stir-fried with minced pork, garlic, and chili (suan dou jiao). The fermentation gives a sour, salty punch that cuts through fatty meat and seasons the whole dish.

Sour pickled long bean is a cornerstone of Sichuanese and southwestern Chinese home cooking — a lacto-fermented vegetable that delivers clean, complex sourness without vinegar's blunt sharpness. Salted beans ferment at room temperature for three to seven days; natural Lactobacillus convert sugars to lactic acid, producing a bright yellow-to-olive pickle that is crunchy and layered in sour‑umami depth. This pickle holds its texture through high‑heat stir‑frying and is an essential pantry item, especially in late summer when long beans are abundant. Two practical types exist: a short‑fermented, chili‑ginger variety used as a vegetable, and a longer‑fermented, softer type used as a condiment.

Measured in: g
Storage: Fridge

Types & varieties

Sichuan 酸豇豆

Short‑fermented (3–5 days), seasoned with dried red chilies and ginger during fermentation; bright yellow, spicy‑sour; the standard for mapo tofu and suanjiang rou ding

Plain Brined 泡豇豆

Fermented in simple salt brine only; neutral sour‑salty flavor; versatile; commonly sold in vacuum‑sealed bags at Chinese markets

Hunan‑style

May use rice‑washing water in brine for added acidity; sometimes adds crushed garlic; suited to hongshao and ganbian preparations

Guizhou‑style

Often fermented with wild pepper (荆芥, Zanthoxylum) leaves or stems; noticeably numbing and aromatic

Yunnan‑style

May include rice bran (米糠) in brine; slightly earthier flavor profile

Pantry vs. Commercial

Commercial bottled or bagged pickled long beans vary significantly. Some are naturally fermented (check the ingredient list for just beans, salt, and water). Others contain added vinegar, which produces a sharper, less complex sourness. If a recipe calls for raw fermented beans, do not substitute pasteurized commercial product without adjusting cooking time — pasteurization softens the texture and changes how the ingredient behaves in the wok. Vacuum‑sealed bags from Chinese markets are typically cooked and ready to eat; home‑fermented beans are raw and must be cooked through before serving.

Read ingredient lists: vinegar indicates commercial pasteurized product, not traditional fermentation
Pasteurized beans are softer and may disintegrate in long cooking; raw fermented beans hold texture better
If using commercial product in a raw‑ferment recipe, briefly blanch before using

Common uses

Suanjiang Rousi (酸豇豆肉丝) — minced pork stir‑fried with fermented long beans, the canonical Sichuanese dishMapo Tofu (麻婆豆腐) — Sichuan version adds chopped pickled beans as a vegetable element alongside the tofuGongbao Chicken (宫保鸡丁) — some regional versions incorporate chopped pickled beans for sour backboneFried rice and congee seasoning — finely minced, wok‑fried with egg and scallionZha Jiang Mian (炸酱面) — Northern Chinese noodle sauce variationPai Fan (炒饭/炒粉) — fried rice and fried rice noodlesSimple stir‑fry side — wok‑fried with minced garlic and a drop of sesame oil as a cold side dishFilling for bao and mantou — mixed into savory steamed bun fillingsStir‑fried with firm white fish (罗非鱼, tilapia) in Sichuan and Guizhou cuisineHot and sour soups — regional preparations use chopped pickled beans as a souring agent

Tips & pitfalls

Never use iodized table salt — it contains additives that inhibit lactobacillus; non‑iodized sea salt or kosher salt only
Submerge beans completely in brine; any portion above the liquid line will spoil rather than ferment
A 3–5% brine (30–50 g salt per liter) is the reliable working range; too little salt risks mold and spoilage, too much prevents fermentation from starting
Glass or ceramic vessels are preferable to plastic — plastic retains odors and may interact with fermentation acids
Burp the jar daily during active fermentation; CO₂ buildup can push liquid out or create pressure
Cloudy brine and light foam are normal — they indicate healthy lacto‑fermentation, not contamination
Use a loose cloth cover or plastic lid during fermentation; metal lids can corrode from the acidic environment
Chop fermented beans finely (3–5 mm dice) before stir‑frying; larger pieces cook unevenly and create a distracting chewiness
Squeeze out excess brine before adding to the wok; too much moisture causes steaming instead of frying and dilutes the sauce
For a less sour result, soak chopped beans in cold water for 10–15 minutes before cooking
Briefly pre‑fry chopped beans in hot wok oil before adding other ingredients — this firms the texture and deepens the flavor

Nutrition

31kcal

Energy

130 kJ · per 100 g

Where the calories come from

Protein 20%Carbs 77%Fat 3%

Protein

1.8g

4% DV

Carbs

7.1g

3% DV

Fat

0.1g

0% DV

Fiber

3.4g

12% DV

Sugars

3.3g

of which

Sodium

6mg

0% DV

Notable micronutrients

Vitamin K36% DV

Vitamin C18% DV

Folate9% DV

Riboflavin (B2)8% DV

Thiamin (B1)7% DV

Iron6% DV

Source · USDA FoodData Central · approx. Beans, snap, yellow, raw

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In the shops

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Good to know

Common Names: Sour pickled long bean; pickled yardlong bean; fermented cowpea; Chinese: 酸豇豆 (suān jiāngdòu); Sichuan: 泡豇豆 (pào jiāngdòu)
Fresh Base: Yardlong bean (Vigna unguiculata subsp. sesquipedalis), also called asparagus bean or Chinese long bean; or common cowpea (Vigna unguiculata)
Primary Origin: Sichuan province, China; also essential in Hunan, Guizhou, and Yunnan cuisines
Flavor Profile: Sour, slightly salty, clean fermented tang — acidity comes entirely from natural lacto‑fermentation, not vinegar
Color After Fermentation: Bright yellow to olive‑green, depending on freshness of beans and fermentation length
Shelf Life (Refrigerated): 2–4 weeks submerged in brine in a sealed jar
Difficulty: Beginner‑friendly; requires only salt, water, and patience — no special equipment or starter culture

Substitutes

Sour mustard greens (酸菜) — Different vegetable and texture, but similar sour‑salty profile; use as a 1:1 substitute in stir‑fries and fried rice; widely available in Chinese and Southeast Asian markets
Kimchi (Korean fermented vegetables) — Different flavor (chili‑forward, funkier) but provides the same fermented‑sour function; works in fusion or non‑authentic preparations
Sauerkraut — Cabbage‑based, milder acidity; acceptable in a pinch but flavor profile is quite different; not appropriate for authentic Sichuan preparations
Pickled green beans (from Indian or Mediterranean cuisines) — Often too vinegary (acetic acid) rather than naturally fermented; rinse and reduce added salt in the dish when substituting
Fresh long beans + rice vinegar — Quick weeknight substitute: cook fresh beans until tender, splash with rice vinegar and a pinch of salt; never replicates the depth of true fermentation but workable for speed