1
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Using a zester, remove the zest from five Naval Oranges and the rest of the fruit and discard the white pith. Chop the zest coarsely. Place in a bowl and set aside.
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2
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Squeeze the juice of all fruit adding the pulp that does not have pith with it. Set aside.
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3
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Measure the amount of fruit juice. Add enough water to bring the total liquid up to 12 cups.
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4
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Place all of the zest and 2 cups of the juice in a large saucepan. Reduce to 1 cup.
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5
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Pour the rest of the juice and baking soda in the saucepan and bring to a boil. Reduce the heat and simmer for 20 minutes, stirring occasionally. Reduce liquid to about 9 cups. Simmer longer if necessary.
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6
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Add the pulp from the fruit and simmer for another 15 minutes.
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7
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Measure the sugar and set aside. Do not reduce the sugar or the marmalade may not set properly.
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8
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Stir the pectin into the simmering fruit mixture. Bring to a full, rolling boil.
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9
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Quickly stir in the sugar and return to a rolling boil, about 220°F. Reduce the mixture about ¼. The mixture should begin to darken.
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10
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Before proceeding, check the setting properties of the marmalade by removing about 3 Tablespoons and placing in a bowl. Set the bowl in the refrigerator for about 5 minutes. Check the marmalade to see that it is setting - jelling - after cooling.
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11
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If the test bowl is not jelling, keep reducing the batch of marmalade and check every 3 minutes.
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12
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When you are satisfied that the marmalade will jell properly, remove from the heat.
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13
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Pour the hot marmalade into clean canning jars and seal. Hot pack for 10 minutes. This marmalade will keep in the refrigerator for up to 2 months if you do not seal the jars. The marmalade will also keep for up to 1 year frozen.
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