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Zap the frozen corn niblets in the microwave with some water just until they are all thawed and no cold spots are left. About 5 to 6 minutes should do it. Drain well.
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Add to a large pot, along with all the other ingredients down to and including the chile flakes.
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Bring to a boil, then lower to a simmer for 30 minutes.
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Add liquid smoke to taste, if using.
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Pack hot into quarter-litre (1/2 US pint) jars or half-litre (US pint) jars.
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Leave 2 cm (1/2 inch) headspace.
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Debubble, adjust headspace.
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Wipe jar rims.
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Put lids on.
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Process in a water bath or steam canner.
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Process either size jar for 15 minutes; increase time as needed for your altitude.
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Best after at least a few weeks of jar time.