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1
Preheat oven to 250u00b0. Remove zest from oranges with a vegetable peeler and put zest on a baking sheet (save fruit for another use). Bake until zest dries, starts to curl up, and begins to brown, 20 to 25 minutes. Let cool.
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2
Put all ingredients except sugar in a 1-qt. glass jar and seal tightly. Let sit in a cool, dark place for 2 weeks.
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3
Strain liquid through cheesecloth into a 1 1/2- to 2-qt. glass jar (save flavorings) and set aside. Put flavorings in a small saucepan with 2 cups water. Cover and bring to a boil, then reduce heat and simmer 10 minutes. Set aside.
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4
Cook sugar in a small saucepan over medium-high heat, lifting and shaking pan occasionally, until sugar caramelizes and turns deep amber, 8 to 10 minutes. Pour caramel into liquid in pan (it will bubble furiously and may firm up). If needed, return pan to medium heat and cook, stirring, for a few minutes until caramel melts again.
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5
Set pan in a bowl of ice water until liquid is cold, about 10 minutes. Pour into jar with first infusion. Seal and let stand in a dark place 5 days.
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6
Strain final mixture through cheesecloth into a glass measuring cup and discard flavorings. Divide bitters into small jars and seal tightly.
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7
*Find at liquor stores.
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8
Make ahead: Up to 1 year, chilled.
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9
Bottle it: 5-in. clear glass bottle, $99; save-on-crafts.com
