Place chillies, onion, garlic and ginger into the bowl of a food processor and blend until finely chopped.
Transfer chilli mixture to a large saucepan along with the remaining ingredients. Place over a medium heat, stirring until the sugar fully dissolves.
Increase heat to medium-high and bring to the boil. Reduce heat to medium-low and simmer for 35-40 minutes or until you reach a jam like consistency (It will continue to thicken on cooling). Spoon the hot jam into clean dry jars. Seal then invert for 2 minutes then set aside to cool completely. Store in a cool, dark place. Once opened, store in the fridge. Makes about 2 1/2 cups.