How to Make Fermented Scallions
Lacto-fermented scallions transform fresh green onions into a tangy, probiotic-rich condiment. The fermentation mellows the sharp bite while adding complex sour notes that enhance countless dishes.
Category: Vegetables · Method: Lactic Acid · Time: 5-10d · Difficulty: 1/5 · Yield: varies · Temp: 18-22°C
History
Fermenting alliums is practiced across cultures, from Korean fermented green onions to Eastern European pickled onions. Lacto-fermented scallions offer a quick, flavorful preservation method.
Ingredients
- 2 bunches Fresh scallions — About 500g
- 2% of weight Sea salt — Non-iodized
- 2 cloves Garlic — Optional, sliced
- 1/2 tsp Chili flakes — Optional
Equipment
- Glass jar
- Fermentation weight
- Knife and cutting board
- Airlock or loose lid
Instructions
Salt and massage
Toss the scallions with the salt and optional aromatics in a large bowl. Massage gently for several minutes to begin breaking down the cell walls. Note that unlike cabbage, scallions are fibrous and may not release enough liquid to create a full self-brine immediately.
Time: 10 min
Tip: Let the salted scallions sit for 30 minutes before packing to encourage natural juice release.
Pack jar and submerge
Pack the scallions tightly into a clean jar, pressing down firmly to eliminate air pockets. If the released juices do not fully cover the scallions, add a 2% salt-water brine (10g salt dissolved in 500ml water) until they are completely submerged. Use a fermentation weight to keep all solids below the liquid line.
Time: 10 min
Tip: Crucial: Alliums are prone to floating; any vegetable matter exposed to air will likely develop mold or aerobic spoilage.
Fermentation Timeline
- Day 1: Start ferment — Scallions packed and weighted.
- Day 3-5: Active fermentation — Bubbles. Sourness developing.
- Day 7-10: Ready — Tangy, softened scallions.
Signs of Success & Spoilage
Good signs
- Olive-green color
- Tangy, pickled aroma
- Slightly softened but still snappy texture
- Cloudy brine (indicates active lactic acid bacteria)
Warning signs
- Mushy or disintegrating texture (spoilage)
- Fuzzy mold (white, black, or green) on the surface
- Putrid or 'rotten egg' sulfur smells
- Brown or dark grey discoloration
Troubleshooting
- Slimy or 'ropy' brine
- Cause: Pediococcus bacteria Solution: This is a harmless phase often caused by temperature fluctuations. It usually resolves on its own as the acidity increases. If the texture is slippery but the vegetable is firm, it is safe; if the vegetable is mushy, discard.
- Too soft
- Cause: Fermented at too high a temperature or for too long. Solution: Move to refrigeration sooner. Ensure you are using non-iodized sea salt to maintain texture.
- Mold on top
- Cause: Air exposure due to floating vegetables. Solution: Discard if mold is present. Next time, ensure a fermentation weight is used and the brine level is maintained at least 1 inch above the scallions.
Storage
Refrigerate in brine Keeps 2-3 months. Flavor develops over time.
Health Benefits
- Probiotic bacteria
- Vitamin K
- Prebiotics
- Antioxidants
- Low calorie
Serving Suggestions
- Asian noodle topping
- Taco garnish
- Rice bowl addition
- Omelet filling
- Sandwich topping
Related Vegetables Ferments
Other Lactic Acid Ferments
- Kefir — Dairy
- Yogurt — Dairy
- Hot Sauce — Condiment
- Water Kefir — Beverage
- Fermented Radishes — Vegetables
- Fermented Green Beans — Vegetables
- Fermented Okra — Vegetables
- Fermented Asparagus — Vegetables