Categories: Blackberries, Jellies or Jams
Ingredients
- 4 cups crushed fresh ripe, blackberries (8-9 pint baskets)
- 7 cups sugar
- 1/2 teaspoon unsalted butter
- 1 (3 ounce) package liquid pectin
Directions
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In an 8-quart pan, combine the blackberries, sugar, and butter.
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Over med-low heat, stirring constantly, heat the mixture until the sugar is completely dissolved.
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Increase heat to med-high and bring the mixture to a full rolling boil; stirring constantly.
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Stir in all the pectin; return mixture to a full rolling boil, stirring constantly.
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Boil, stirring constantly, for 1 minute.
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Remove pan from heat; skim off any foam.
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To prevent the jam from separating in the jars, allow the jam to cool 5 minutes before filling jars.
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Gently stir the jam every minute or so to distribute the fruit.
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Ladle the hot jam into hot jars, leaving ¼ inch headspace.
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Wipe the jar rims and threads with a clean, damp cloth.
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Cover with hot lids and apply screw rings. Process half-pint jars in a 200° water bath for 10 minutes, pint jars for 15 minutes.
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Tip: after cooking blackberry jam, the center white cores of the berries, to which the individual seeds were attached, will rise to the surface of the jam; as you stir the jam during the 5 minute standing period before ladling it into the jars, you may skim off as many of these cores as you can find-purely optional, but recommended if entering this jam in a competition.
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Tip: you may use frozen blackberries-you will need 2 to 3 (16 oz.) bags; do not rinse frozen berries before defrosting, and be sure to add all of the released juice to the pan, or the jam will be too thick.
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Tip: To reduce the quantity of seeds in the jam, sieve about ¼ of the berry pulp before measuring.