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1
Preheat oven to 425u00b0F. Cook butter, garlic, lemon zest, and rosemary in a small pot over medium heat, stirring occasionally, until butter is melted. Reduce heat to low and let simmer to infuse flavors, about 5 minutes.
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2
Brush turkey generously with butter mixture on all sides and under skin, getting some garlic and lemon zest under skin-that'll make it taste so much better. Season turkey with 1 Tbsp. plus 1 tsp. salt and 1 Tbsp. pepper on all sides and arrange skin side up on a rimmed baking sheet. Pour 1/2 cup wine around turkey pieces.
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3
Cover with foil and roast turkey 20 minutes. Uncover, brush tops of each piece with butter mixture, and continue to roast until an instant-read thermometer inserted into the thickest part of each piece registers 165u00b0F, 40-50 minutes. Some pieces might be done before others, so test each one. Let turkey rest 20 minutes before slicing.
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4
Meanwhile, strain pan drippings through a fine-mesh sieve into a heatproof measuring cup or bowl. Skim fat off surface (or use a fat separator if you have one). You should have about 1/2 cup drippings. Whisk in cornstarch until smooth.
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5
Bring remaining 1/2 cup wine to a boil in a large skillet over high heat. Cook until reduced by half, about 3 minutes. Add broth and continue to cook, stirring occasionally, until reduced slightly, about 5 minutes. Whisk in turkey drippings and bring to a boil. Cook, stirring occasionally, until thick enough to coat the back of a spoon, about 6 minutes. Season with salt and pepper.
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6
Transfer turkey to a platter. Serve with pan sauce alongside.
