Instructions: Wash and pick over the plums; do not pit or peel. Crush them in the bottom of a large enameled kettle with the 1 cup of water, bring to a boil, simmer for 15 minutes. Crush again with a vegetable masher as the fruit softens.

Strain through a jelly bag; add a little water to bring the measure up to 5 cups of juice. Return juice to the kettle, reserving 1 cup in which to mix the pectin; combine pectin and reserved juice and bring to a full boil, stirring constantly. Add the sugar, continue stirring, and boil hard for 2 minutes.

Remove from heat, skim, and immediately pour into hot sterile half-pint jars, leaving 1/4-inch headspace. Cap and give a 5 minute hot water bath.

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