Hub 04 · Fermenting Vegetables
How to make sauerkraut in a mason jar
Cabbage and salt in a jar. The whole method takes twenty minutes of work and about two weeks of waiting, and almost nothing can go wrong if it stays submerged.
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What you need
- One cabbage
- Non-iodized salt — sea salt or pickling salt
- A wide-mouth quart jar, clean
- A weight, or the cabbage’s own outer leaf
- An airlock lid, or a band left finger-tight
- A kitchen scale
Nothing else. No starter culture, no whey, no vinegar, no special vessel.
Step 1: reserve a leaf, then shred
Peel one large outer leaf off and set it aside — you will use it to cover the surface. Quarter the cabbage, cut the core out, and shred the rest. Fine shreds release water more readily and pack tighter; a food processor is fine.
Step 2: weigh, then salt
Weigh the shredded cabbage in the bowl, then add salt at the ratio your tested recipe gives. Toss it through thoroughly so no pocket is unsalted.
Use a scale rather than spoons. Salt varies enormously in density between flake salt and fine sea salt, so a volume measure is not a ratio.
Step 3: work it until it makes its own brine
Massage and squeeze the salted cabbage for several minutes. It will go limp and liquid will pool in the bowl. That liquid is the brine, and you do not add water to make it — the cabbage produces enough on its own.
If after ten minutes of working there is genuinely not enough liquid, a small amount of brine mixed at the same salt concentration as your recipe can top it up.
Step 4: pack the jar
Press the cabbage in a handful at a time, pushing down firmly so the brine rises above the level of the shreds. Pour the liquid left in the bowl in after it.
Leave one to two inches of headspace. A jar packed to the rim pushes brine out past the lid as it ferments and rises, which drops the level and can expose the top.
Step 5: submerge everything
Fold the reserved outer leaf over the surface, tuck the edges down, and set a weight on top. Nothing solid should be above the brine — that surface is the one place a ferment fails, as covered in is fermenting vegetables safe.
Fit an airlock lid, or leave the metal band finger-tight and open the jar once a day.
Step 6: wait, and check daily
Leave it at room temperature, out of direct sunlight. Expect bubbling within a couple of days and cloudy brine — both normal. Check each day that everything is still submerged and push it back down if not.
Start tasting from about day seven. When it tastes the way you want it, put it in the fridge with a plain plastic storage lid. Cold slows the ferment almost to a stop, so it holds at the flavor you chose.
Temperature changes everything
A warm kitchen ferments fast and can produce a softer texture. A cool room ferments slowly and tends toward a crisper result. Neither is wrong. If your jar is doing nothing after three days, it is almost certainly the room temperature rather than a failed ferment.
Frequently asked
Questions
+How much salt do you use for sauerkraut?
Weigh the cabbage and use the salt ratio given by a tested recipe from a food-safety authority — we link the National Center for Home Food Preservation below. Use a scale rather than spoons, because salt density varies enormously between types.
+How long does sauerkraut take to ferment?
Start tasting at about a week. Two to four weeks is common, and the pace depends heavily on room temperature — a warm kitchen ferments much faster than a cool one. Refrigerate when it tastes right to you.
+Do I need to add water to sauerkraut?
Usually not. Working salted cabbage for several minutes draws out enough of its own liquid to cover it. If there is genuinely not enough after ten minutes, top up with brine mixed to the same salt concentration as your recipe.
+Why is my sauerkraut not bubbling?
Most often the room is too cold. Fermentation slows dramatically at low temperatures. Move the jar somewhere warmer and give it more time before concluding anything is wrong.
Sources
Where the facts on this page came from
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