INGREDIENTS
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2 tablespoons unsalted butter, softened
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5 garlic cloves, 1 minced
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1/2 teaspoon minced rosemary plus 2 rosemary sprigs
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1/2 teaspoon minced thyme plus 2 thyme sprigs
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1/2 teaspoon finely grated lemon zest
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Salt and freshly ground pepper
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One 4-pound chicken, at room temperature
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1 large onion, cut into 8 wedges
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1 lemon, cut crosswise into 8 rounds
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1/2 cup chicken stock or low-sodium broth