Home fermentation: start with a cabbage, not a lab
Want to try fermenting at home? Start with a small batch of sauerkraut, learn what safe fermentation looks like, then decide whether kimchi, kombucha or sourdough deserves your time.
Reviewed, edited and approved by Editor-in-chief Daniel Sköld · Updated 24 October 2026
Contents
There is a particular pleasure in opening a jar of cabbage you salted yourself and finding that it has become something sharp, savoury and excellent alongside a sausage. No specialist crock, secret culture or cupboard full of expensive kit required.
Fermentation can also produce kimchi, kombucha and sourdough, though they demand different amounts of attention. If you are new to it, begin with vegetables. They give you the most flavour for the least fuss, provided you follow a sound recipe and take cleanliness seriously.
AD
How do you ferment cabbage at home?
Start with sauerkraut: cabbage, salt, a clean container and time. Bacteria naturally present on the vegetables turn sugars into lactic acid, giving the cabbage its tang. This is not the same as pouring vinegar over shredded cabbage. Both have their place, but only one rewards you with the slightly absurd satisfaction of having made your own ferment.
For a manageable batch, weigh 500g of trimmed white cabbage and 15g of salt. That salt-to-cabbage ratio comes from Good Food’s sauerkraut recipe; use scales rather than guessing with a spoon. Shred the cabbage finely, mix in the salt and massage it for five minutes. Wait five minutes, then massage it again. It should soften and release enough liquid to make its own brine. Add a little caraway if you like it with pork, or leave the flavouring out for your first attempt.
Pack the cabbage into a thoroughly cleaned container, pressing it down firmly. Weight it so the cabbage stays beneath its brine, leave room above the liquid and cover it against dust without trapping the gas produced as it ferments. A small glass jar and a suitable weight will do; you do not need to buy a ceramic vessel the size of a toddler. If the cabbage will not stay covered, consult the recipe’s instructions for adding brine rather than leaving dry shreds exposed.
Keep it out of direct sunlight at a steady, cool room temperature of about 18–20°C. Check it daily and release any built-up gas. Good Food’s recipe says it can be ready after five days, although it can ferment for longer. Taste a little with a clean fork once it has developed a pleasantly sour flavour, then refrigerate it. Chilling slows fermentation; it does not turn your jar into a shelf-stable preserve.
Is homemade kimchi difficult?
Not particularly, once you have made cabbage ferment once. Kimchi adds seasoning and a little more preparation, but the useful habits are the same: follow a tested recipe, keep your equipment clean and pay attention to how you store the finished food. Its Korean roots deserve better than calling any chilli-covered vegetable scraps kimchi.
Chinese leaf is the cabbage to look for. Larger UK supermarkets often stock it, and an Asian food shop is a good place to find gochugaru, the Korean chilli flakes used in many recipes. Garlic, ginger, spring onions and fish sauce are easier to find. Check the fish sauce label if you are cooking for someone with a fish allergy; choose a recipe designed to be vegetarian if you want to leave it out.
For your first batch, use a complete kimchi recipe rather than borrowing the salt from one, the timings from another and the chilli quantity from a third. Salting, rinsing and draining the cabbage may all be part of the method. Follow those steps as written. Some quick versions also contain vinegar and can be eaten straight away; they are useful condiments, but they are not a shortcut to a fully fermented kimchi.
Get the salt, cleanliness and storage right first. You can experiment with the chilli later.
Once you have a batch you enjoy, use it where its heat and acidity earn their keep: in a cheese toastie, beside grilled pork or stirred through fried rice. Sauerkraut belongs next to sausages and mustard, but it is just as good against the richness of a baked potato with butter. Start with a forkful, not a mountain. You are adding seasoning to dinner, not trying to win a cabbage-eating contest.
AD
Should you make kombucha or sourdough next?
That depends on whether you would rather tend a loaf or manage a fizzy drink. Sourdough starter is flour and water fed over several days until it becomes active enough to raise bread. Good Food’s starter begins with 50g strong white flour, 50g strong wholemeal flour and 100ml water, then takes about seven days of feeding. It is a satisfying project if you already enjoy baking. The finished loaf is baked, however, so do not mistake sourdough for a way of eating live starter cultures.
Kombucha is fermented sweetened tea made with a culture known as a scoby. Its tartness can be lovely, especially when you want something more interesting than another glass of water. It is also a less forgiving first project than cabbage: clean equipment matters, fermentation creates gas, and pressure can build up dangerously in bottles. If you want to explore it, buy a bottle to see whether you actually like it before committing space to a home brew. Then follow a reputable brewing method from beginning to end.
Do not assume homemade kombucha is alcohol-free. Fermentation produces some alcohol, and its strength is difficult to judge in your kitchen. Check the label when buying a drink if avoiding alcohol matters to you; for a dependable alcohol-free option, try sparkling water with citrus or an alcohol-free beer. The UK Chief Medical Officers’ guidance, published in 2016, is not to drink regularly more than 14 units of alcohol a week, spread over three or more days if you drink that much.
How can you tell when a ferment has gone wrong?
Expect a changing smell and flavour, not a laboratory-grade constant. Cabbage should become pleasantly sour; bubbling is part of the process. Mould, a rotten smell or anything else that makes you doubt a batch is reason to discard it, not scrape off the top and hope. Never taste a suspect ferment to decide whether it is safe. The Food Standards Agency advises using reputable preserving recipes, keeping preparation areas clean and throwing food away when you are unsure it has been properly preserved.
Do not confuse fermenting cabbage with sealing vegetables or garlic in oil. The Food Standards Agency warns that home-preserved foods, particularly foods preserved in oil, can pose a botulism risk if prepared incorrectly. Stick to the method you chose; improvisation is more fun at the dinner table than at the preservation stage.
Finally, make it for flavour rather than a promised medical transformation. The NHS says evidence for many claims about probiotics is limited. If you have an existing condition or a weakened immune system, seek medical advice before using probiotic supplements, and follow any food-safety advice given by your care team. A well-made jar of sauerkraut needs no grand health claim. It only needs a decent dinner to go with it.
In short
For your first home ferment, make a small batch of sauerkraut using a reliable recipe, clean equipment and measured salt. Keep the cabbage beneath its brine, monitor it, then refrigerate it when it tastes pleasantly sour. Try kimchi next; save kombucha and sourdough for when you know which project you will enjoy maintaining.
Angus Irvine writes about food and drink for men 45 and over who like to eat well but don't want a performance. Recipes that work on a weeknight, dinners worth the effort at the weekend, what to pour with them – wine, beer and the good alternatives – and the restaurants and pubs worth the trip. Without the fuss.
One of Midcent's writers. Spotted something? Write to angus@midcent.uk.
Most home stir-fries come out soggy and grey. Here’s how to get proper heat, crunch and flavour from a wok on a British hob: the kit, the prep and the timings.
Booked somewhere smart and quietly dreading the cutlery? Here’s how to handle fine-dining etiquette in a British restaurant with good manners, no stiffness and no faff.
Red with meat and white with fish? Not necessarily. Here’s a practical guide to choosing wine for the food you actually cook, without turning dinner into an exam.
Three fast weeknight dinners built on vegetables and beans: a harissa traybake, a buttery bean pan and a green curry. Proper flavour, real fullness, no lecture.
