Place everything into a heavy-based 3 litre capacity saucepan over a medium–low heat. Bring to the boil then reduce to a simmer and cook, stirring occasionally, for 1½ hours until it has a chutney-like consistency. Take off the heat, pour into sterilised jam jars and seal. The red sauce will keep in a cupboard for at least a year. Once opened, store in the fridge and use within 3 months.