|Berries||1 Pint (570 Milliliter)|
|Wine vinegar||1⁄2 Pint (285 Milliliter)|
|Finely chopped onion||1 Tablespoon|
1) With a fork, strip the berries from the stalks. Place them in a large thermos flask and pour wine vinegar all over. Allow to steep overnight.
2) The next day, strain off all the liquid and boil in a stainless steel pan alongwith the rest of the ingredients. Cook for about 15 minutes.
3) Bottle the mixture in a sterilized container. Leave for at least a month prior to using.
4) Serve or use as required.