Updated October 2026
Making Chilli Sauce in New Zealand
Most New Zealand chilli crops ripen in a rush in late summer and autumn. Here is how to turn them into sauce without the risks.
For a sauce that keeps in the pantry, use a tested vinegar chilli sauce recipe and process the bottles in boiling water: the NCHFP cayenne pepper sauce takes 10 minutes for jars up to 473 ml at up to 300 m above sea level. A fermented chilli sauce has no tested shelf-stable method, so blend it with vinegar, keep it in the fridge and use it within a few weeks. Never keep chillies under oil at room temperature.
Salt for a fermented batch
Hot Sauce Ferment Brine Calculator
Enter the weight of your chillies and pick a salt strength. The calculator assumes you add water equal to the chilli weight so the chillies sit under brine, then works out the salt across the whole batch.
For a fridge-stored fermented sauce only; this is not a tested recipe. Use non-iodised pickling salt or fine cooking salt, weigh it, and keep every piece of chilli under the brine.
Fermenting chillies in a cool climate
A New Zealand kitchen in April is usually cool, which suits a slow ferment. Below about 15°C it may stall, so a shelf in the hot water cupboard (check it stays below about 24°C) helps. Pack stemmed chillies into a clean glass jar, cover them with brine made from the calculator, weigh them down so nothing floats, and vent the lid daily. Taste from a week; most batches are ready in one to three weeks.
Blend with some brine and vinegar of 5% acidity (check the label; vinegar here can legally be 4%), bottle, and refrigerate. Skim off any flat white yeast film; throw out batches with fuzzy coloured mould, sliminess or a rotten smell.
Pantry sauce: tested recipes only
Bottled sauces for the cupboard need a recipe that has been tested, made exactly as written and processed in boiling water. NCHFP's cayenne pepper sauce and its tomato-based easy hot sauce are two. Adjusting a fermented sauce to a pH figure at home is not a tested method, so we do not recommend storing one outside the fridge.
Growing for sauce
Chillies need a long warm season. In Auckland, Northland and Bay of Plenty they ripen outdoors from late summer; further south a greenhouse or a sunny wall gives a far bigger crop. Pick fruit as it colours and freeze it whole until you have enough. Wear gloves for hot varieties and keep your hands away from your eyes.
See also: chilli heat scale and pickling.
Sources we checked (October 2026): National Center for Home Food Preservation: Cayenne Pepper Sauce, Easy Hot Sauce, Freezing Hot Peppers, General Information on Pickling; Food Standards Code Standard 2.10.1; CSIRO, Preservation of vegetables and herbs in oil; New Zealand Food Safety (MPI), Clostridium botulinum or botulism.
Common questions
How long does fermented chilli sauce keep?
Kept in the fridge, a few weeks. There is no tested method for storing it at room temperature.
Can I grow enough chillies outdoors in the South Island?
Usually only with a greenhouse or a warm, sheltered wall. Freeze the fruit as it ripens until you have a batch.
Can I preserve chillies in oil?
Only for a short time in the fridge, or frozen. Chillies in oil have caused botulism.