Lacto-Fermented Courgette Kraut — A Casa Adora Small Batch

Marta's store had just taken delivery of a crate of courgettes — grown by a local man whose name I can never quite remember. It'll be José, Juan or Antonio. I had first dibs.

I had been looking at a courgette kraut recipe online. It was heat-processed — a water bath at 85–90°C that would kill every live culture in the jar before the lid was even on. Good as a pickle, perhaps. Useless as a ferment. I wanted the real thing: a lacto-fermented courgette kraut, alive, with caraway, made in small enough quantities to actually fit in my kitchen.

This is it.

Why This Fermented Courgette Recipe Works — And Why You Need to Move Fast

Lacto-fermentation works the same way with courgette as it does with cabbage — salt draws out the vegetable's natural liquid, creating a brine in which Lactobacillus bacteria thrive and multiply, acidifying the jar and preserving everything inside it. The difference is that courgette is softer, higher in water, and lower in natural sugars than cabbage. It ferments faster and loses texture sooner.

In a cool Northern European kitchen, this might take five to seven days. At Casa Adora in late August — where temperatures run between 34°C and 38°C as we slide into September — three days is enough. Possibly less. This is not a set-and-forget ferment. Taste it on day three. If it's pleasantly sour and still has some bite, it's done. Move it straight to the fridge.

The caraway seeds are not decoration. Caraway is a traditional kraut spice — it adds warmth, cuts through the acidity, and has its own mild antimicrobial properties that support the fermentation. Use them.

Lacto-Fermented Courgette Kraut — The Recipe

Makes 1 x 650ml jar

Ingredients

• 500g courgettes
• 10g fine sea salt (2% by weight)
• ½ tsp caraway seeds, crushed

Equipment

• 1 x 650ml sterilised jar with airlock lid
• Box grater or food processor

Method

Wash and dry the courgettes. Halve them lengthways and scrape out the seeds with a spoon — the seeds hold excess water and will make the kraut mushy if left in. Shred or coarsely grate the flesh into a bowl.

Add the salt and crushed caraway seeds. Mix well with clean hands, squeezing as you go — you want to start breaking down the cell walls and drawing out the liquid. Set aside for 20–30 minutes. The courgette will release a significant amount of liquid. This is your brine.

Pack the courgette tightly into the sterilised jar, pressing down firmly with your fist or a clean pestle so the brine rises to cover the shreds completely. Leave 2–3cm of headspace. Fit the airlock lid.

Leave to ferment at room temperature. At Andalucían summer temperatures — 34–38°C — taste from day two. At cooler temperatures, taste from day three. You are looking for a pleasant sourness, a slight fizz, and courgette that still has some texture. When it's there, seal the jar and move it to the fridge immediately.

It will keep in the fridge for two to three weeks. The flavour will continue to develop slowly.

Notes

Do not go by the calendar — go by taste. In a hot kitchen this ferment moves fast. In a cool kitchen it moves slowly. The thermometer on your wall matters more than the date on your phone.

If the courgette rises above the brine during fermentation, press it back down. Exposure to air encourages kahm yeast — a white film that is harmless but unpleasant. Keep everything submerged.

The kraut is mild and delicate compared to cabbage sauerkraut. To preserve the live cultures, serve it cold or at room temperature — stirred through a salad, alongside cold meats, or as a condiment on a cheese board. If you do cook with it — sautéed in ghee with onions alongside roast meats or sausages, or folded into potato pancakes — the flavour is excellent, but the probiotic benefit is gone. Both are valid. Know which you're going for.

This fermented courgette recipe will keep in the fridge for two to three weeks — and improve with every day it sits.

This fermented courgette recipe is part of my Fermentation Hub — a collection of small-batch ferments, lacto-fermented vegetables, and live culture recipes from the Casa Adora kitchen.
You'll also find it in my Gut Health Recipes collection — real food from a rural Andalucían kitchen, built around fermented foods, high-fibre pulses, wholegrains and prebiotic-rich ingredients.
And in my Veg, Fruit & Pulses hub — a complete collection of vegetable recipes from Casa Adora and the road.
Find more recipes and food adventures here.
Wonky photos, proper food, genuine adventures — The Flexible Chef