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Remove husks from the ground cherries, then measure the first time.
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Put cherries in large stew pot and crush so that they are all at least broken.
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Heat to a boil along with enough water to get them to cook without burning, about ½ cup.
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Boil 2 minutes.
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Measure cooked berries, this is the amount of sugar to add later.
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Return ground cherries to the pot.
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Add the chopped orange with any juice that is oozing away.
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Add ground cinnamon if using, and the pectin.
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Bring mixture to full boil, boil 1 minute.
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Add sugar in an amount equal to the volume of cooked ground cherries.
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Bring to full boil for 5 minutes.
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Put into jars and hot water bath process for 10 minutes.