Guide to Fermentation

What is Fermentation?

Fermentation is one of the oldest and basic forms of preserving food. Fruits and vegetables contain natural bacteria that, when deprived of air, can suppress and inhibit the growth of other microbes that would cause spoilage. During the fermentation process, these natural bacteria convert the carbohydrates and sugars in food to an acid which creates an ideal environment for preserving. Lacto-fermentation, a process brought on through the presence of lactobacillus, gives fermented foods and drinks their signature tangy and sour taste, but also creates probiotics that aid digestion.

Due to their health benefits, fermented foods such as kimchi and sauerkraut have become increasingly popular in recent years. Making fermented foods at home is a cheap and healthier alternative to shop bought products and allows you to experiment with new and exciting flavours.

Top tips for fermenting at home:

  • When filling the Kilner® Jar, leave 2.5 inch/6.5cm headspace. This allows for any expansion of food/liquid during the fermentation process.
  • Always use filtered water.

  • We recommend to use salt free of iodine and anti-caking agents.

  • Always ensure food inside the Kilner® Jars is completely submerged under the salt brine. The Kilner® Weights included in the fermentation sets will help to weigh down food and allow the anaerobic fermentation process to take place.

  • The Kilner® Fermentation Jars should be kept at 17.8°C to 24°C, this is the ideal temperature for the fermentation process.

  • Once ready, screw on the one piece lid and transfer to the refrigerator to slow down the fermentation process. Consume within one month.

  • We recommend you check the fermenting food on a regular basis. You may find that some foam has appeared on the top of the food; this is perfectly normal and can be removed using a skimmer or stainless steel spoon. We also recommend to clean the inside of the top of the jars to remove any debris or juices. It is important to ensure that all food remains submerged under the salt brine.

  • If mould appears in the ferment, discard the batch and start again. Always ensure the lid is securely fitted onto the top of the jar to create an air tight seal.

View Our How To Video

Explore Our Favourite Fermentation Recipes

Care & Use 

  • Before use, ensure the Fermentation Set is clean and free of any food remnants.
  • Hand wash air lock valve.
  • Kilner® Jars, Lid and Weights are dishwasher safe.
  • Do not pour boiling water directly into the glass jars.

Start making your own fermented foods