Roughly chop chillies. Take out the seeds before chopping if you like a mild chilli sauce. Place the chopped chillies in a blender with a little bit of vinegar, blend on high speed for a minute. Then place all the ingredients, including the chillies, into a sauce pan and bring to the boil, reduce to a simmer. Simmer for approximately 30 minutes or until the chillies and sultanas are very soft. Let cool. Then in a clean blender blend the chilli sauce until smooth and creamy. You should end up with approximately 1.5 litres of chilli sauce. Bottle into sterilised jars.