INGREDIENTS
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3 tablespoons unsalted butter, softened
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1 tablespoon fresh thyme leaves, chopped
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1 tablespoon chopped fresh rosemary
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Kosher salt and freshly cracked black pepper
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1 large onion, roughly chopped
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1/2 cup low-sodium chicken broth
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3 tablespoons Worcestershire sauce
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1 (3-pound) bone-in turkey breast
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6 demi French baguettes, sliced in half
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3 tablespoons unsalted butter, softened
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12 slices Gruyere cheese