Traditional Fermented Sauerkraut
Sauerkraut is the result of lactic acid bacteria consuming the sugars in cabbage to create a sharp, crunchy, and stable preserve. You achieve this by massaging salt into shredded cabbage until it releases its own brine, packing it tightly into a jar to exclude oxygen, and letting time and ambient temperature handle the rest.
Consistency is your main constraint.
The ratio of salt to cabbage is the only hard rule; use 2% of the cabbage weight in sea salt to ensure the right environment for fermentation.
- Large mixing bowl
- Kitchen scale
- Wide-mouth glass mason jar
- Glass fermentation weight or a small cabbage core
What goes in.
- 2 lbsGreen cabbage, outer leaves removed
- 18 gramsFine sea salt (non-iodized)
Submergence
The cabbage must remain beneath the surface of its own liquid at all times to prevent surface mold. If the cabbage isn't covered, the environment becomes aerobic, which invites spoilage rather than fermentation.
The method.
Shred the cabbage
Quarter the cabbage and remove the dense core. Slice the leaves into thin ribbons, about 1/8 inch wide.
Massage
Place the cabbage in a bowl and sprinkle the salt over it. Work the salt into the leaves with your hands for about 10 minutes until the cabbage is limp and a puddle of brine has pooled at the bottom of the bowl.
Pack
Stuff the cabbage into the jar, handful by handful. Press down firmly after each addition to force air pockets out and encourage more brine to rise to the top.
Weight
Place your weight on top of the cabbage so it stays submerged in the brine. Leave at least two inches of headspace at the top of the jar.
Ferment
Seal the jar loosely and store in a cool, dark place. Open the jar every few days to release pressure, or use an airlock lid. Start tasting after two weeks; it is ready when it reaches a tanginess you enjoy.
When it doesn't go to plan.
Use non-iodized salt, as iodine can interfere with the bacterial culture.
Save one large, clean outer cabbage leaf to place on top of the shredded cabbage before adding your weight; it acts as a secondary barrier.
If the temperature in your kitchen is above 75°F, fermentation will happen much faster, so check the jar daily to avoid over-softening.
The ones that keep coming up.
What if there isn't enough brine to cover the cabbage?
Add a small amount of salt water—one teaspoon of salt dissolved in a cup of water—until the cabbage is fully submerged.
Is white film on top of the brine dangerous?
If it is a thin, white powdery layer, it is likely kahm yeast. It is harmless but can affect the flavor, so scoop it off. If the growth is fuzzy, colorful, or smells putrid, discard the batch.
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