Directions: Place whole chillies, garlic and onion in a food processor or blender and process to make a paste. Transfer to a small saucepan and stir in sugar, water, cornflour and vinegar. Bring to the boil, reduce heat and simmer until thickened.
Remove from heat and set aside to cool. Transfer to a warm sterilised jar. Seal and label when cold. Store in the refrigerator until required.