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Place strawberries, pectin and butter in non-aluminum pan and stir until a rolling boil is achieved.
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Pour all sugar in at once and continue stirring until a rolling boil is achieved again – then allow to boil for 60 seconds – don’t skimp!
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Take off stove and ladle into sterilized (in dishwasher) jars.
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Top with flats that have been simmering in water on stove.
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Screw tops on tight and place in a simmering water bath for 10 – 15 minutes.
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Take out and allow to cool in a draft free environment for 24 hours.