It’s that time of year when we have cabbages coming out of our ears. Sauerkraut is a really simple and safe way to not only preserve, but to also enhance the nutritional value of these humble vegetables. It just so happens that we have a bumper crop of fennel too so we’ve been making my favourite fennel and cabbage kraut on repeat, and you can too! All you need is a big glass jar, a smaller jar or glass that fits inside it, salt, cabbage and fennel.
Don’t be intimidated by the science behind fermentation. It can feel a little counter-intuitive to encourage microbes to thrive and multiply, but microbes are an essential part of us and part of a healthy world. We would not be here without them, and we certainly wouldn’t be able to grow our organic vegetables without them making our soil healthy and teaming with life. Eating fermented vegetables like this sauerkraut is scientifically proven to boost your gut health, which has a positive knock on effect to your overall health and wellbeing.
Sauerkraut is very simple. Just mix shredded cabbage (and fennel too in this recipe) with enough salt to make it pleasantly salty, pack it tightly into a clean jar and weigh it down so that the vegetables stay safely submerged in brine. Allow fermentation to happen at room temperature for about a week, then remove the weight and pop your jar of tangy, pickley goodness into the fridge to have as a side or sandwich filler to many meals over the coming months.
Find some large jars and give them a really good clean and a hot rinse. You can sterilise if you like but it is not strictly necessary.
Give your vegetables a rinse to remove any dirt. Carefully peel off and reserve a couple of outer leaves of your cabbage.
Finely shred your remaining cabbage and the fennel bulbs using a sharp knife, a mandolin or a food processor. Place the shredded vegetables into a large, clean mixing bowl.
Sprinkle over the salt then use your hands to tumble the salt through the shredded vegetables. Once it is evenly dispersed, start squeezing and massaging the salt with the shredded vegetables.
You will soon notice that the salt is drawing liquid out of the vegetables and the vegetables are decreasing in volume. Taste a spoon of the mixture and decide if you would like to add more salt or not. It should just taste pleasantly salty.
The mixture is ready to pack into the jar when it is very wet. You can test this by picking up a large handful and squeezing. There should be loads of lovely brine dripping from your hands into the bowl.
Pack the mixture very firmly into the jar. It’s best to do this a couple of handfuls at a time so that you can push down each layer nice and tight. You want to ensure that no air pockets are in the jar. Use your fist if it fits in the jar, otherwise a clean rolling pin is perfect for poking and packing down the mixture.
Keep going until you have used all the mixture or until you have at least an inch of headroom left in the jar. You don’t want to overfill it! But do include the brine that the salt has drawn from the vegetables. The more brine the better!
Now grab those outer leaves you reserved earlier. Break them to size, they should be just bigger than the surface area of the packed cabbage and fennel mixture. Tuck a leaf carefully into a jar and push it neatly over the shredded veg mixture but under the brine. The aim is to prevent any little bits of shredded veg from floating up to the surface of the brine and catching mould. The brine should rise above the cabbage leaf and all the shredded bits should be safely tucked underneath it. You may be able to push the edges of the cabbage leaf down against the sides of the jar to really tuck the mixture in. Try use a spoon or your fingers.
Pick off any floating bits of shredded vegetables and clean up your jar with a piece of kitchen paper or a clean tea towel. Then add a weight to weigh down the cabbage leaf which will keep everything safely submerged in brine. You can use anything that will be food safe and not be affected by the salt. So a smaller glass jar filled with water is good – just ensure the metal side does not touch the salty brine or it can corrode. Another good option is to use a small water glass or glass ramekin. If it fits right, putting the lid on the jar should pin the glass down and keep everything submerged.
Put the lid on the jar. If you are using a clip-top jar, remove the rubber seal first, this will allow gases to escape during fermentation and there will be non need to ‘burp’ your jars. If you are using a screw top jar you will need to ‘burp’ your jar twice a day by carefully loosening then tightening the lid. You should hear the gases escape and see bubbles rising to the top of the ferment.
Keep the jar on a plate or tray to catch any spills, at room temperature for 1 week. Not in direct sunlight. It’s best to ‘burp’ over the sink in case you have a very active ferment. It should be very active and bubbly between days 2 and 4/5 then it will calm down. If the action of the bubbles causes your ferment to rise above the brine, just use a clean hand or utensil to push everything back down under brine and carry on.
After a week your sauerkraut should be tangy and delicious. Remove the weight and the cabbage leaf. Replace the rubber seal if using a clip top jar, put the lid back on and place the jar in the fridge.
Your sauerkraut should stay fresh in the fridge for at least 3 months but often up to 1 year! To make it last well, do not double dip and move into smaller, clean jars as you work your way down the big jar. This means less air in the jar and less chance of it drying out and getting susceptible to mould.
The just-packed jar before I removed the floating bits of cabbage and fennel. You can just about see the cabbage leaf and glass which is holding the bulk of the shredded veg under brine.The finished product after a week of fermenting at room temperature.
If you like a classic potato salad with mayonnaise, you’ll love this one. The added extras like tangy sauerkraut and pickles and earthy-sweet carrots and beetroot make it a step up from the norm. What’s a barbecue or buffet without a bowl of potato salad? Try this one with our fresh-from-the-fields new potatoes, carrots and beetroots. You could even make your own vegan mayo, fermented cucumbers and sauerkraut using our farm produce and groceries too if you like! Otherwise we stock mayonnaise, pickles and sauerkraut in our grocery section.
Liz x
Ingredients
12 new potatoes
1 beetroot
2 carrots
3 tbsp aioli/mayonaise
2 tbsp sauerkraut
4 tbsp chopped fermented/pickled cucumbers
large handful of dill/fennel fronds (or chopped chives)
Method
Halve the new potatoes and dice the carrots, then boil together until tender. Drain them and allow to cool.
Boil the beetroot in its skin in a separate pan until tender. This takes around 30 minutes. Then run the beetroot under cold water and rub the skin off and dice into 1 cm pieces.
Dice the fermented/pickled cucumbers.
Chop the dill or fennel fronds.
Combine all ingredients in a large bowl.
Gently stir the ingredients together then taste and add salt or pepper if needed.
A red and white cabbage, apple, caraway and bay kraut I made before Christmas 2020.
The Perfect Place to Start your Fermentation Journey
Once you have mastered the basics of sauerkraut, and it really is basic, you can apply these principles and techniques to many other ferments and play around with the ingredients. You can use a variety of cabbages, you can add other vegetables like grated carrot or beetroot, you can use different herbs or spices to create different styles of sauerkraut, you can even suspend whole apples into your crock/jar to ferment along with you sauerkraut as a German friend of mine taught me to do.
My kimchi recipe, which I will share with you soon, uses the same technique as sauerkraut. The difference being the cut of the vegetables and the all important spice paste. My fermented hot sauce uses the same technique too! Brine fermentation also works through the same simple process of lacto-fermentation to acidify the vegetables. Salt + vegetables + a jar is all you need to produce incredible delicious and nutritious ferments.
My fermenting shelf from last summer.
Why Ferment?
I first got hooked on fermenting many years ago when I had a surplus of cabbages delivered to my old cafe from our local farm. There’s only so much cabbage soup and coleslaw you can sell so we decided to try making sauerkraut as a means to preserve them, stop them from going off and being wasted. It was a revelation! We had no idea then about the health benefits, we were just blown away by the taste. Since that day, I bought lots of books on the subject, incorporated ferments into much of our menu and even started a stall in a farmers market called ‘Fermental’ selling fresh, unpasteurised ferments made with local, organic ingredients.
The science and nutritional benefits behind vegetable fermentation are really interesting to read about. There are so many perks to including ferments into your everyday diet. The importance of encouraging and introducing beneficial bacteria into our digestive system is becoming more well known and rather than taking a pill, this is a delicious way to do that. Fermenting vegetables also makes them easier to digest and makes the nutrients in them more readily available, and the organisms that enable fermentation are themselves beneficial too! All of this is good news for your body and your immune system, but its also great news for your taste buds. Fermented food is delicious! Complex, tangy, crunchy, sour and salty.
Is it Safe?
Lacto fermenation is a very safe way of preserving vegetables and it’s very easy too – no need for fancy equipment, all you need is a knife, board, jars, vegetables and salt. It can sound scary dealing with microbes. We have been trained to try to disinfect all surfaces and food from bacteria, moulds and yeasts so perhaps encouraging bacteria to thrive will feel strange at first. But the importance of our microbiome and the diversity of microbes that we need in our guts to be healthy is now becoming common knowledge. For me, as a chef, the main reason I ferment is for flavour, not medicine. The health benefits are just a bonus. And yes, it is perfectly safe as long as you follow some basic principles.
Submerging vegetables in brine protects them from harmful bacteria and allows ‘good’ bacteria to thrive. Lactobacilli, the good guys, are anaerobic, meaning they don’t need oxygen. So by keeping the vegetables neatly submerged in brine we are protecting them from the ‘bad’ bacteria that need oxygen to thrive, thereby taking out the competition for the ‘good’ lactobacilli. Salt in the brine also inhibits yeasts which would break the sugars down in the fruits/veg into alcohol instead of lactic acid. Salt is the perfect preservative for vegetables, but it’s important to get the right amount. Too much will inhibit fermentation and too little will result in a rotting crock/jar. Thankfully its quite simple, your best guide is your tastebuds! Your salted vegetables should just taste pleasantly salty.
optional herbs/spices like fennel seeds, dill, juniper, caraway, turmeric, pepper…
Method
Prepare a large jar to hold your ferment. Just give it a good wash and a rinse, no need to sterilise. Find and wash a smaller jar which fits neatly into your large jar. This will act as a weight.
Rinse your vegetables and pull off some of the outer leaves of the cabbage and put to one side. These will act as ‘followers’. A ‘follower’ is like a cartouche which neatly holds down any bits of chopped veg under the brine which may float up and become exposed to air.
Shred the cabbage (and any other veg if using) into a large bowl or your biggest pot.
Add extra flavourings to your tase if you like. A few juniper berries, some chopped dill, fennel/caraway seeds, turmeric and black pepper etc… just choose one or two flavours at most.
Massage in about 1 tbsp of natural, fine/flakey sea salt per regular sized cabbage volume. If you are unsure about doing this instinctively, you can weigh the shredded vegetables then work out what 2% of that weight is and add that amount of salt. Once the salt is fully incorporated, taste it and see if it is salty enough. It should just taste pleasantly salty. If its too salty add more vegetables, if it’s not salty enough add more salt. Easy!
Cover the bowl and allow the salt to do some of the work for you for about half an hour. Then give the mixture another good massage and you should see a lot of brine forming. There should be no need to add extra brine or water, the salt draws the water from the vegetables and creates its own delicious brine.
Once your veg is nice and briney, when you squeeze a handful lots of brine comes out, you can start packing it into your jar. Do this carefully and thoroughly. Take one or two large handfuls of the mixture at a time and firmly press them into the bottom of your jar ensuring there are no air pockets.
Keep going until you have used up all the mixture or until you have a good couple of inches left of head room in the jar. If you made a large amount or only have smallish jars then you may need to use a few jars.
Now its time to add your ‘follower’ or cartouche. Get the cabbage leaves you saved earlier, break them to size if you need to, then wedge them into the jar, neatly covering the whole surface area of the ferment. Take your time to carefully tuck the leaf down around the edges of the ferment. Ideally the level of brine will rise above the ‘follower’.
Digitally coloured illustration of a sauerkraut recipe from my book which you can purchase at the farm shop here
Then you need to add a weight to ensure the shredded vegetables stay submerged. The cheapest and easiest weight is simply a smaller jar filled with water. Make sure its nice and clean, no lables left on the outside. And make sure the lid does not come into contact with the brine. Salt and metal react and you don’t want a rusty metal lid sitting in your ferment! So just make sure the smaller jar can’t fall over inside the bigger jar and it should be fine.
Other weights you can use are scrubbed and boiled beach pebbles (make sure they are not chalk/limestone), you could even use a ziplock freezer bag filled with water/stones. You can also buy specially designed fermentation weights of course. made from glass or ceramics – if you really get into fermenting then these are a worthwhile investment.
Then loosely cover the jar to allow the gases produced during fermentation to escape. Use the lid, or if the lid doesn’t fit over your weight then you can cover the jar with a tea towel and secure it with an elastic band or string.
Place the jar on a plate or tray to catch any potential overspill. Then ferment at room temperature, out of direct sunlight for a week or two.
Check on your ferment daily. Push down on the weight to expel any air pockets/bubbles that form during fermentation. Taste it after one week and if it has soured to your liking you can remove the weight and follower and refrigerate it. Otherwise keep fermenting it at room temp for another week or so for a funkier, tangier taste.
Once refrigerated it will keep well for a very long time up to and over a year even, if you look after it. That means no double dipping – you don’t want to introduce new bacteria from your mouth into the jar, scrape down the sides to keep all the veg together – bits that dry out and are exposed to air are more likely to catch mould. Consider transferring your finished ferment into a few smaller jars before refrigerating. This will mean that the ferment is exposed to less air and last longer.
Newly made kraut on the left, and one that has finished fermenting on the right. The purple cabbage will turn into that beautiful crimson colour as it acidifies.
Let me know in the comments or over on our friendly Facebook page if you have any questions or need me to troubleshoot. More fermenting blogs and videos coming soon. Happy fermenting! Liz x
