Place all of your ingredients into a large, heavy-based pan and bring to a gentle simmer, stirring occasionally.

Simmer for 1 hour.

Using a handheld blender, blend all of the ingredients, but not so much that it becomes a puree.

After simmering, bring to a gentle boil so that the mixture turns dark, jammy and shiny.

Place into sterilized jars and place in the fridge for the night. Will keep for 6 weeks.