Aromatic bases & spice pastes
Duo Jiao (Chopped Fermented Chili)
剁椒 · A Hunan foundational aromatic base consisting of finely chopped fresh red chili peppers that are salt-cured and lacto-fermented, typically with garlic, ginger, and a splash of high-proof liquor. The paste preserves fresh chilies into a long-keeping, salty-spicy-sour condiment that functions as a reusable building block across the Hunan (Xiang) kitchen.
The formula
10:1 chili:salt by weight; 1 splash baijiu + pinch sugar per batch
Sources vary slightly: ~450 g chilies to 25–30 g salt (1.5 tbsp). Garlic and ginger roughly 1:4 to chilies by weight.
Identity
- Hunan (Xiang) regional specialty
- Lacto-fermented chili condiment/base
- Uncooked cold-cure preparation (no heat applied)
- Long-keeping shelf-stable base when fully salted
- Foundational component equivalent in role to Sichuan doubanjiang
- Bright red color preserved through salt-curing
Ingredients
| Base | fresh red chili peppers (thin-skinned, ripe) | Hunan-style thin-skinned red chilies preferred; wear gloves when chopping |
| Seasoning | fine sea salt or kosher salt | Drives lacto-fermentation and preservation; non-iodized preferred |
| Aromatics | garlic cloves, chopped | Adds pungent depth; traditional addition in most Hunan recipes |
| Aromatics | fresh ginger, chopped | Optional but common; lends warmth and complexity |
| Liquid | baijiu (or Shaoxing wine / clear rice liquor) | High-proof alcohol suppresses spoilage molds and adds aroma |
| Sweetener | sugar (small pinch) | Balances acidity; some recipes use lime juice instead |
| Acid | fresh lime or lemon juice | Alternative to baijiu; adds bright tang without alcohol |
Method
- 1Wash chilies thoroughly, drain, and air-dry completely on a tray until no surface moisture remainsResidual water introduces spoilage organisms and ruins the controlled lacto-fermentation
- 2Pinch off green stems (leave caps on), then finely chop or pulse chilies to a coarse mince, wearing glovesFine chopping increases surface area for salt penetration and uniform fermentation; cap-on preserves interior moisture
- 3Mince garlic and ginger (if using); toss with chopped chilies in a non-reactive bowlEven distribution ensures consistent flavor and antimicrobial action throughout the batch
- 4Add salt (~10:1 chili-to-salt by weight), sugar, and a small splash of baijiu; mix thoroughly by hand or spatulaSalt draws out chili juices to create the brine needed for anaerobic lacto-fermentation; baijiu inhibits surface molds
- 5Pack mixture firmly into a sterilized glass jar, pressing down until juices rise to cover the solidsSubmerging the chili pulp under its own brine creates an anaerobic environment that favors lactobacilli over yeasts and molds
- 6Seal loosely (or 'burp' daily for the first week) and store at cool room temperature 2–4 weeks to fermentLoose lid allows CO2 from active fermentation to escape; full flavor develops as pH drops below ~3.5
- 7Transfer to refrigerator once desired tang is reached; use as a base by the spoonfulCold storage halts fermentation at peak flavor and preserves the vivid red color for months
Techniques that matter
Cold salt-curing (no-cook lacto-fermentation)
Preserves fresh chili color, aroma, and enzymatic activity that heat would destroy
Wearing gloves and venting the room
Capsaicin causes severe skin and eye irritation; airborne vapor can sting airways
Pressing solids under brine
Excludes oxygen, which is the primary defense against mold and aerobic spoilage
Aging in glass (not metal)
Salt and acids react with metal, causing off-flavors and discoloration
Variations & derivatives
Pure duo jiao (chilies + salt only)Old-style Hunan villages
Most minimalist version; deepest pure chili flavor, no aromatic distraction
Duo jiao with garlic and gingerModern Hunan home cooking
Most common contemporary form; layered pungency
Fermented bean-and-chili duo jiaoHunan market jars
Adds diced fermented soybeans for umami depth
Green duo jiao (qing duo jiao)Late-summer Hunan
Made with unripe green chilies for a sharper, more vegetal profile
Used in these dishes
Substitutions
- baijiu → clear high-proof rice vodka or Shaoxing wine — Works for mold suppression and aroma, though flavor differs slightly
- baijiu → fresh lime or lemon juice — Adds acidity and slows surface spoilage without alcohol; tangier final flavor
- fresh Hunan red chilies → Fresno or red jalapeño chilies — Closest Western substitute in heat and thin skin; skin slightly thicker
- fresh Hunan red chilies → Thai red chilies — Much hotter and thinner-skinned; reduce quantity by ~30%changes result
Troubleshooting
White film or fuzzy growth on surface
Mold from inadequate brine submersion or residual moisture → Skim carefully, ensure solids stay submerged under brine, and add a splash more baijiu; if widespread, discard
Dull brownish color instead of vivid red
Over-exposure to oxygen or use of wet chilies at start → Press down to release more brine and reduce headspace; consume sooner and refrigerate
Bland or one-dimensionally salty without tang
Insufficient fermentation time or too much salt → Return to room temperature for another 1–2 weeks in a loose-lidded jar to develop lactobacilli
Too watery / runny after mixing
Normal salt osmosis; excess brine will balance as fermentation proceeds → Allow to ferment further, or strain off a portion of brine for use as a chili-flavored seasoning liquid