INGREDIENTS
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2 1/ 4 cups fresh orange juice
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Strips of zest from 2 navel oranges
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Three 3-inch-long cinnamon sticks, broken into pieces
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PUNCH
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3 cups fresh orange juice
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2 cups fresh red grapefruit juice
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1 tablespoon grenadine syrup
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2 1/2 cups cold grapefruit soda (20 ounces)
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Orange slices and ground cinnamon, for garnish