One cabbage and a tablespoon of salt makes about a litre of sauerkraut that keeps for six months in the fridge. That is the whole trick. No vinegar, no canning gear, no starter culture. The cabbage ferments itself in its own juice, and salt is the only thing you buy.
I make mine every autumn when my beds give me more cabbage than we can eat fresh. A row of cabbage all comes ready at once, which is the gardener’s curse. Fermenting is how I stretch that single week of harvest across half a year. If you have not put cabbage in the ground yet, the what-to-plant-now calendar tells you whether your zone is still in the window.
What you need
The ratio is the only number that matters: 2% salt by weight of cabbage. Weigh the cabbage, multiply by 0.02, that is your salt. For a 1kg cabbage that is 20g, roughly a tablespoon.
- 1 cabbage (any kind, green or red, about 1kg to 1.5kg)
- Plain salt, no iodine, no anti-caking agents (rock salt or pickling salt)
- A clean wide-mouth jar, about 1 litre
- A smaller jar or a zip-lock bag of water to weigh the cabbage down
- A set of kitchen scales
That is it. I have made this with one cabbage and I have made it with eight at once in a crock. The ratio scales straight up.
The method
- Pull off the outer leaves and set one aside. Quarter the cabbage, cut out the hard core, then shred the rest fine. Thin shreds release juice faster.
- Weigh your shredded cabbage. Work out 2% of that weight in salt.
- Pile the cabbage in a big bowl, scatter the salt through it, and massage it hard with your hands for five to ten minutes. It goes from dry to wet as the salt pulls the water out. You want a small puddle in the bottom of the bowl.
- Pack the cabbage into your jar, pressing down firmly as you go so the brine rises over the top. Leave a few centimetres of gap at the top.
- Take that outer leaf you saved, fold it over the packed cabbage, and put your weight on top. Everything must sit under the brine. Cabbage that pokes above the liquid is cabbage that goes mouldy.
- Cover loosely. A lid resting on top, or a cloth and a rubber band. The jar needs to breathe because fermenting makes gas.
- Leave it on the bench out of direct sun. Taste it after five days. When it is sour enough for you, screw the lid down and move it to the fridge.
How long it takes, and how warm
Temperature drives the whole thing, so this is where your climate zone changes the timing. The climate-zone growing guides tell you when cabbage is in season where you are, which is when you will have the glut to ferment.
- In the tropics and subtropics, a Brisbane or Darwin kitchen sits warm, and mine is usually sour and ready in five to seven days. Warm ferments move fast, so taste early.
- In cool and cold temperate zones, a Hobart or highlands kitchen in winter, it can take two to three weeks. Slower is fine. The flavour is often better for it.
- In the heat I tuck the jar into the coolest cupboard I have. Above about 24 degrees it can ferment too fast and go soft. If your kitchen is hot, find your coolest corner.
Once it is in the fridge it keeps six months easily, often closer to a year. The cold slows the ferment to a crawl. I am still eating last autumn’s batch.
The payoff
A bag of sauerkraut at the shops runs you a fair bit for a small tub. One home cabbage gives you a litre or more for the price of a spoon of salt and twenty minutes of work. When cabbage is cheap and plentiful in your own bed, that is close to free food on the shelf for months. I keep an eye on the price tracker to see when cabbage is cheapest at the shops, which is also when it is cheapest to grow a row of your own for the jar.
It goes on everything. Sausages, fried eggs, cheese toasties, the side of any roast. Once you have a jar on the go you find reasons to use it.
Grow a few extra cabbages next season just for this. Once you have made one batch you will want a second jar fermenting before the first one runs out. The only real hazard is forgetting to burp a tightly lidded jar, which it will do for you, loudly, all over the bench.
