Combine all ingredients in a large heavy-based pot
Stir so that the sugar is dissolved, then bring to a boil over high heat.
Reduce heat and boil gently, stirring occasionally, for 45 minutes to 1 hour until mixture is thick enough to mound on a spoon.
Mash quince to desired consistency.Let it cool slightly then ladle the chutney into jars, make sure to leave 1/2 inch of headspace.
Add a drop of vodka to the top of the contents
Put the jars in a cool, dark place for 1 to 2 months so that the flavours develop.