Using a blend of long red and cayenne chillies, this is a surprisingly simple sauce to make, and matures with time.
Roughly chop the chillies and red capsicum and put into the bowl of the food processor.
Tip into a large pan and add the remaining vinegar, together with the salt and sugar.
Slowly bring to the boil, stirring until the sugar has dissolved.
Reduce the heat and simmer, uncovered, for 35-40 minutes, until thickened.
Pour into warm sterilised bottles and seal immediately.