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Thaw and drain blueberries.
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Crush blueberries one layer at a time.
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Combine 3 cups of crushed blueberries and lemon juice in a large saucepot.
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Stir in pectin.
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Bring mixture to boil, stirring constantly.
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Add sugar, stirring to dissolve.
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Return mixture to a rolling boil.
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Boil hard for 1 minute, stirring constantly.
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Remove from heat and skim off any foam.
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Ladle hot jam into jars, leaving 1/4 inch of head space.
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Process jars for 10 minutes in a water bath.
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Allow to cool for 24 hours.