Dice or finely chop onion and raisins – a food processor or chopper works best.
Mix all ingredients together in a large cooking pot or Dutch oven.
Bring just to a boil, reduce heat and simmer for about an hour or until mixture is slightly thickened.
Pack into clean, pint canning jars; leaving ½ inch headspace. Wipe jar lids, cover with two-piece lids, and process in a boiling water bath canner for 10 minutes.
Remove from canner and let sit overnight before removing lid rings and storing.
Makes about 5 pints.