• 400g tin of chopped tomatoes
• 200g molasses
• 100ml vinegar
• 1 grated onion
• salt
• 1 red chilli
• 2 tsp worcester sauce

Put all ingredients into a saucepan (no need to fry up the onion first, we want the juice of the onion to be part of the sauce), bring to a boil and simmer half an hour. Put through a blender, and boil down until the consistency is right (another half hour with the lid removed).

The sauce can be put into sterilized jam jars and will keep that way.