METHOD:

Sauerkraut, affectionately referred to as Kraut, uses the dry-salting fermentation method. This is simply salting and massaging the shredded vegetable, to extract the natural juices. Remaining submerged in these juices, the vegetables are transformed by a lactic acid fermentation into a melange of tangy deliciousness. If you are unfamiliar with kraut fermentation process, I suggest you read the NOTES section below before starting.

1. Thoroughly wash and peel the carrots and ginger. Remove any damaged areas and the green carrot tops. Coarsely grate either by hand using a box grater or in a food processer.

   Do not use ground ginger in place of fresh ginger as it will produce an inferior flavour. When purchasing fresh ginger, avoid older rhizomes with signs of shrivelling, as the flesh is likely to be fibrous. 

2. Place into a large bowl. Sprinkle with salt and cumin seeds and mix. Allow to stand for 10-15 minutes to start the release of the natural juices. This will make the massage process easier. 

   Using freshly washed hands or food grade gloves (if preferred) massage the mixture until it looks wilted. The texture will be softer and more malleable, and the mixture will have released more juice. If your hands tire, pound the mixture gently. I use the pestle from my mortar and pestle. A wooden mallet or meat hammer will also work. 

3. Pack the mixture tightly into the clean dry fermentation vessel, leaving a 5 cm (2 inch) head space from the top of the jar. This will allow the carrot mixture to expand and the gasses to escape. Push down with your fist so the liquid rises and covers the mix by approximately 2 cm (3/4 inch). This will also remove any air bubbles. Wipe the rims with a clean cloth or paper towel.

   Weight down the kraut to keep under the juices. Refer to the Notes Section below on Weighting the Kraut.

4. Cover the container and allow to ferment at room temperature, out of direct sunlight, for 2-3 weeks. The covering method will depend on the type of fermentation container used. Refer Notes Section below: Fermentation Containers. The time will depend on the ambient room temperature. Check regularly to make sure the mixture remains submerged and taste regularly until it reaches your prefer sauerkraut style – a fresh milder fermented taste or a mature full bodied fermentation profile. 

   Burp the jar daily if you are fermenting in a container that doesn’t allow the gases to escape. Refer the Notes Section below: Fermentation Containers, Jars with Sealable Lids. 

5. When you are happy with the flavour, transfer to clean dry jars, label and store in the fridge. This will stop the fermentation process. 

   Unopened it will keep for several months. Once opened eat within 2 months. Refer the Notes Section below on Storing the Kraut.

NOTES:

• Thoroughly wash your hands to prevent any contamination during the massaging stage. Wash all equipment in hot soapy water and dry prior to use.
• Chlorinated water. Chlorine is often added to water supplies specifically to kill potentially harmful microorganisms. Adding heavily chlorinated water slows, inhibits, or can prevent fermentation. Chlorine can be removed by, (1) passing the water through a filter,(2) boiling the water, or (3) placing water in a large open pot for 1-2 days to allow the chlorine to evaporate.
• After experimenting with a number of different types of fermentation containers, I use a ceramic crock with a moat and disks to weigh down the ferment for larger batches. For my small batch experiments, I use a jar with an airlock lid. Both options consistently produce excellent ferments that require little additional effort during the fermentation stage. I’ve provided a description of the most popular container options for home preserves. Experiment and find which one works best for your lifestyle and budget. 
• TYPES OF FERMENTATION CONTAINERS 
  • Learning to ferment doesn’t require an expensive outlay on specialist fermenting crocks. Different shaped vessels offer different functional benefits. Wide mouth jars with or without sealable lids or with lids which have airlocks attached, or ceramic crocks with or without lids are the most popular options. Regardless of the type of vessels used, the kraut still must be weighed down and remain submerged in its natural juice and brine during the fermentation process. 
• Glass Jars
  • Jars with sealable lids.
  • Wide mouth jars are better as it’s easier to get the kraut in/out. Sauerkraut fermentation, unlike kombucha or vinegar ferments, does not require oxygen or microbes from the air and can be fermented in a sealed container. After packing the jar, weigh the kraut down using the plastic bag method, as outlined in Notes Section below: Weighting the Kraut, and seal with the lid.
  • A by-product from the fermentation, CO₂ gas, will build up and create pressure in the jar. To prevent the jar from exploding, it is important to release the pressure, by removing the lid, so the gas can escape, and then reseal it. This process is known as “burping.”
• Jars covered with cloth
  • After packing the jar, weigh the kraut down using the plastic bag method, as outlined in Notes Section below: Weighting the Kraut. Cover with a heavy cloth and secure tightly to the jar. The disadvantage of this method is it’s open to the air and aerobic moulds and yeasts can form on the top of the sauerkraut. This should be scraped off as soon as it’s noticed. The kraut can still be used as the moulds and bacteria are unable to grow in the anaerobic environment of the kraut. However, some people do not like to do this. If you are one of those, use the sealed jar or airlock method. 
• Jars fitted with an airlock.
  • Jars with airlock attachments for lids are relatively inexpensive to purchase from preserving outlets and speciality homeware stores After packing and weighting the kraut mixture to 2 cm (1 inch) from the top of the jar, attach the airlock lids. Fill the airlock with water to the prescribed level and proceed to the fermentation stage. Different sizes and configurations are available to suit a variety of budgets and are easy to search on the internet. Some popular brands are Fowlers Vaccola, Kilner, Masons, and Le Parfait.
• Ceramic & Pottery Crocks  
  • Ceramic and pottery crocks are ideal for larger scale production. The straight sided cylindrical shape provides a large surface which makes packing, removing, and weighting the kraut easy. Some fermenting crock kits come with ceramic weights for this purpose. Alternatively, it can be weighed down using the plastic bag or plate method and covered with a heavy cloth as described in Notes Section below: Weighting the Kraut. Note moulds and yeasts can still gain entry and create the same problem as outlined in this Section. 
  • Some crocks are designed with a moat around the top of the mouth. This is filled with water and a fitted top sits inside the moat. This prevents oxygen from entering, while allowing the CO₂ gas to escape.
• Metal
  • Fermenting in metallic containers should be avoided. The natural acids from the fermentation and the salt can cause the metal to corrode and contaminate your batch.
• Stainless Steel
  • Industrial stainless-steel containers can be used but not household stainless steel grade containers. A thin stainless coating is applied to a metal base. Corrosion will occur anywhere the stainless steel has been scratch.
  • Enamel pots can be used as the enamel protects the metal from corrosion. Check carefully to ensure the enamel is not cracked or pitted. 
• PREPARING THE KRAUT
  • Use fresh vegetables as they will have a higher water content. During the massage process natural juices will flow creating more liquid for the fermenting stage. 
  • Always thoroughly wash the vegetables and remove damaged leaves or areas to prevent any contamination. If using home grown cabbage be sure to remove any bugs and snails that may be hiding in between the folds of the cabbage leaf. The veggies can be cut by hand or with a mandolin, chopped or grated. However, the finer the veggies, the easier they are to massage. Chopped vegies will change the final consistency of the kraut.
• SALTING THE KRAUT
  • Salting is critical to making kraut as it helps to breakdown the cellular wall structure and draws out the natural juice as well as inhibiting the growth of undesirable bacteria and moulds. 
  • When making your own batches of varying sizes, as a guide use 1.5% salt of the weight of the prepared veggies.
  • Use a good quality sea salt, unrefined, where possible, when preserving. It’s worth hunting around for. Table salt, which is cheap and readily available in supermarkets contains stabilisers and anti-caking agents and often iodide which forms a whitish haze and sediments in pickled vegetable recipes. These additives and in particular iodine can affect the appearance and taste of pickles during the maturation and storage period. The ingestion of a cocktail of anti-caking chemicals such as calcium silicate, sodium silicoaluminate, tricalcium phosphate, magnesium carbonate, silicon dioxide and yellow prussiate of soda, is also unnecessary. Lite Salt may be used in quick pickle recipes; however, it may result in a slightly different taste than expected.
  • The natural calcium and magnesium impurities of unrefined sea salt helps to cross link and reinforce the cell wall pectin’s, creating a crisp pickle.
  • Caution: Reduced-sodium salt in fermented pickle recipes is not recommended. This salt creates a favourable environment for the growth of harmful bacteria. The correct concentration of salt is vital to obtaining the crisp texture of fermented foods and food safety.
• MASSAGING THE KRAUT
  • Massage until the mixture looks wilted and a fair amount of juice has accumulated in the bowl. When using beetroot or purple cabbage in a mix, the juice and final preserve will take on a pink hue. For the massage technique, mix the veggies and salt together using firm scrunching and massaging motions. Add any spice or herb flavourings at this point. An alternative to massaging by hand is to use a wooden mallet, pestle, or the end of a rolling pin.
  • Massaging the kraut is a special moment in the kitchen for me. I put my favourite music on and slip away into a rhythm where the music and massage converge. Leave the veggies to stand with the salt for 10-15 minutes before massaging as this helps to soften them reducing the massage time.
• PACKING THE KRAUT
  • Transfer mixture to a clean dry jar or fermenting crock, progressively packing it down firmly with either your fist or a pounder and adding some juice as you go. Fill jar to approximately 5 cm (2 inch ) from the top of the jar and make sure that mixture has a 2 cm covering of juice.
  •  A firm pack is necessary to make the juice rise over the mixture and to push out the air bubbles. If there is insufficient juice cover the mixture with brine. Make by mixing 1 ½ tablespoons salt with 1 litre (1 ¾ pints) boiling water. Cool before adding to the  mixture. The head space between the top of the mixture when weighted down and the top of the jar is necessary to allow the carrot to expand and provides a space for the gases formed during the fermentation process.
• WEIGHTING THE KRAUT
  • The kraut must remain submerged during the fermentation process. Ferments which are not completely covered will develop a mould or an “off taste.” Professional fermentation crockpots come with ceramic weights. Other methods include using a cabbage leaf and core  for cabbage-based krauts) or the plastic bag method.
• Cabbage leaf method
  • Cover the ferment with cabbage leaves reserved from the cleaning stage. Then push down the reserved cabbage stalk/core. The core should be tall enough to come just above the opening so that when the lid is closed it pushes the core down. The lid will keep it in place and maintains pressure on the core/stalk, thus keeping the kraut submerged.
• Plastic bag method
  • Place a food grade plastic bag inside another to make a double bag. Fill with a brine solution and lay over the kraut mixture. The bag should be a snug fit between the inside of the persevering crock or glass jar and seal the kraut from the air. This will prevent the growth of a yeast film or mould.
  • Adjust the amount of brine in the bag to ensure that kraut is submerged. Twist and tie the bag to form a secure seal. The bag will act as a cushion on the kraut and keep it weighted down. It’s important that the bag is large enough to spread across and completely fill the jar and that it cannot leak.
  • A brine solution is used so that in the event the bag breaks and spills into the  kraut, the fermentation juices will not be diluted by the accidental addition of water. Use the brine solution outlined in the section above :Packing the Kraut.
• Ceramic weights method
  • If using a sauerkraut fermenting crock, after the kraut is packed in, weigh them down with the  kit weights and cover with the supplied lid.
• FERMENTING THE KRAUT
  • Fermentation will start that day after packing. Store the kraut in the kitchen or pantry, out of direct sunlight, somewhere out of the way, but where you can keep an eye on it.
  • The ideal fermenting temperature is 18-20 C (65-68F). If the temperature is lower, the fermentation process will be slower. If it’s hotter the fermentation time will be shorter. Allow the mixture to ferment at room temperature for approximately 2-3 weeks depending upon your taste preference or until bubbles have stopped and no bubbles (gas) rise when the crock or jar is lightly tapped. Check regularly to ensure the mixture remains submerged. 
  • If you are fermenting in a sealed container don’t forget to “burp it” to let the gases out. Refer to Notes Section above: Fermentation Containers: Jars with Sealed Lids.
• STORING THE KRAUT
  • When ferment is ready, transfer to smaller sealable jars. Tightly pack the kraut, cover with the juice and seal. If there is insufficient juice, cover with a  brine solution. Store in the fridge to stop the fermentation process. Unopened it will keep from several months for up to a year. Once open, it’s best to eat within 2 months.