INGREDIENTS
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2 tablespoons unsalted butter, plus 8 additional tablespoons, softened
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1 cup minced shallots
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Coarse sea salt
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2 teaspoons green peppercorns
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2 teaspoons Dijon mustard
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1/2 teaspoon lemon juice, plus a "few grates" lemon zest
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2 tablespoons Worcestershire sauce
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Freshly ground black pepper
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2 tablespoons freshly chopped parsley leaves
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2 porterhouse steak, about 2 1/2 pounds and about 2 1/2 inches thick