Fermenting Vegetables at Home
You do not need fancy starters or specialized kits to begin. Most vegetables carry everything they need on their skins to start the fermentation process once they are submerged in the right concentration of salt.
Control the environment, not the bacteria
The goal is to create an anaerobic environment where beneficial bacteria can thrive while spoilage organisms are kept at bay by the salt and acidic byproduct.
- Glass canning jars with tight-fitting lids
- Kitchen scale
- Weights (glass pebbles or small jars)
- Non-reactive knife
What goes in.
- 1 kgHard vegetables like cabbage, carrots, or radishes
- 20 gNon-iodized sea salt
- as neededFiltered water
Submersion is everything
Vegetables exposed to air will mold. Use a weight to ensure your produce stays pinned beneath the brine level for the duration of the ferment.
The method.
Prepare the vegetables
Wash and chop your vegetables into uniform sticks or shreds. If working with cabbage, shred it finely and massage with salt until it releases enough liquid to cover itself.
Calculate brine concentration
Aim for a 2% total salinity. If you are adding water, weigh your water and vegetable total, then multiply by 0.02 to determine the salt required.
Pack the jars
Stuff the vegetables into a clean jar, pressing down firmly to remove air pockets. Leave at least two inches of headspace at the top.
Add the weight
Place a glass weight or a small, sanitized jar filled with water on top of the vegetables to keep them forced under the brine.
The primary ferment
Seal the jar loosely or use an airlock. Keep it out of direct sunlight at room temperature. If using a standard lid, open the jar once a day for the first week to release trapped gases.
Taste and store
Start tasting after one week. Once the vegetables reach your preferred level of tang, move the jar to the refrigerator to slow the activity significantly.
When it doesn't go to plan.
Always use non-iodized salt, as iodine can inhibit the bacteria you want to encourage.
If white, powdery film appears on the surface, it is likely kahm yeast; it is harmless but can affect the flavor, so skim it off.
Avoid using metal lids directly against the brine, as the salt will corrode them over time.
The ones that keep coming up.
How do I know if the ferment has gone bad?
Trust your nose. A successful ferment smells tangy and sharp, like vinegar or sourdough. If it smells like rotting garbage, slime, or putrefaction, discard it immediately.
Can I use tap water?
Only if your tap water is chlorine-free. Chlorine can kill the beneficial bacteria necessary for the fermentation process; if in doubt, use filtered water.
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