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5
half-pint jarsEasy
Published 2010
This is one of my favorite jams of all time: uncomplicated, fairly tart, and aromatic. Black plums with dark red flesh make a deep ruby jam, but even yellow-fleshed black plums will take on a rosy tint.
Prepare for water-bath canning: Sterilize the jars and keep them hot in the canning pot, put a small plate in the freezer, and put the flat lids in a heatproof bowl. (details.)
Put the plums and sugar in a wide, 6- to 8-quart preserving pan. Bring to a simmer, stirring frequently, then continue to cook for 5 minutes. Pour into a cola
