1. Wash the fruit and remove the stalks.
2. Skin and chop the onions.
3. Put all the ingredients in a pan and simmer gently until they are well broken down and the onions are tender.
4. Rub the mixture through a sieve, return it to the pan and cook until the sauce has thickened and no excess vinegar remains on top.
5. Bottle while still hot, sterilise and seal.
To sterilise bottles see
Sterilising Bottles.