Remove the seeds from the chillies. Using gloves will help to avoid those nasty eye burns should you touch your eyes.
Blend all the ingredients together. A personal blender or hand blender works best for this.
Add the blend to a saucepan and gently simmer to reduce the liquid so that the blend forms a thick paste.
Pour the mixture into sterilised jars and seal.
Refrigerate after opening and use within a month.
