Combine all the ingredients in a heavy pan and bring to a simmer. Turn heat to medium-low and cook, keeping up a strong simmer, for about 30 minutes or until you have a thick, jam-like consistency. Stir frequently and turn the heat down slightly when the chutney thickens to prevent it from sticking to the bottom of the pan.
Remove from heat and let the chutney cool. It will thicken more as it cools.
Pour into a sterilised jar and cover with an air-tight lid. Store in a cool place or keep in the refrigerator.
notes
This chutney will keep in the refrigerator for up to 10 days.