How long will the peppers keep?

Unopened jars keep for 12 months in a cool, dark place. Once opened, keep in the fridge and use within 3–4 weeks.

Can I use a different vinegar?

Yes. Cider vinegar gives a gentler, fruitier flavour and white wine vinegar is more elegant. If you use a weaker vinegar (5% for example), reduce the water so the final acidity stays the same.

Why do my peppers go soft after a month?

Most often because there is no horseradish or cherry leaves. Overlong sterilisation or too high a temperature also causes softening. Hold at 85 °C for 15 minutes.

Do I have to cut the peppers lengthwise?

Yes, cutting lengthwise into six strips is the most suitable method for pickling. Cross-cutting into rings disrupts the fibres and the peppers fall apart and soften in the brine.