Try fermenting vegetables

Fermenting vegetables at home is genuinely ancient technology and requires almost nothing: vegetables, salt, a jar and time. The two rules that matter are getting the salt concentration right and keeping everything below the brine. Almost every failed or unsafe ferment comes from breaking one of those.

Why try fermenting vegetables is worth an hour

Salt at the right concentration favours the lactic acid bacteria already on the vegetables while suppressing spoilage organisms. Those bacteria produce acid, which progressively makes the environment hostile to anything else. Keeping vegetables submerged matters because the process is anaerobic, and anything exposed to air is where mould appears.

How to try fermenting vegetables step by step

1. 1

   Weigh your salt properly

   Around two percent of the vegetable weight is the standard starting point. Guessing is the commonest failure.

2. 2

   Use salt without additives

   Anti-caking agents and iodine can interfere. Plain sea salt or pickling salt is what you want.

3. 3

   Pack tightly and submerge everything

   Use a weight or a cabbage leaf to hold vegetables under the brine. Exposed pieces grow mould.

4. 4

   Let gas escape

   An airlock lid, or open the jar daily. Fermentation produces carbon dioxide and sealed jars build pressure.

5. 5

   Taste from day five onward

   It is ready when you like it. Warmer rooms ferment faster, so time is a guide rather than a rule.

Tips to get more out of it

• Cloudy brine and active bubbling are entirely normal and expected. So is a strong sour smell as the ferment develops.
• Discard any batch that smells putrid, is slimy, or has fuzzy colored mould. When in doubt, throw it out.
• Refrigerate when it tastes right. Cold does not stop fermentation but slows it to a crawl.

Ways to mix it up

If sauerkraut feels like a large commitment, ferment a single jar of sliced radishes or carrots in brine, which is ready within a week. If you enjoy it, kimchi introduces a paste and a wider set of aromatics while using the same underlying principles.

Try fermenting vegetables: frequently asked questions