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Prepare boiling water canner.
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Heat jars in simmering water for at least ten minutes or until ready to use, don't boil.
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Wash lids and bands in warm soapy water and set aside.
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Wash strawberries, remove skins, and place in a wide heavy bottomed saucepan.
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Using a potato masher, gently break down the berries.
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Combine strawberries and lemon juice in saucepan. Gradually stir in pectin.
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Bring mixture to a full rolling boil, stirring frequently until it thickens and begins to gell, about 15 to 20 minutes.
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Ladle hot jam through a funnel and into jar leaving a 1/4 inch headspace.
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Wipe jar rim.
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Center lid on jar and apply band, adjust to fingertip tight.
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Place jar in boiling water canner. Repeat until all jars are filled.
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Process (boil) jars for 10 minutes.
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Turn off heat, remove lid, let jars stand 5 minutes.
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Remove jars and allow to cool 12-24 hours.
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Check lids for seal, they should not flex when center is pressed.