INGREDIENTS
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1 whole trimmed beef tenderloin (4 1/2 to 5 1/2 pounds)
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3 heads garlic
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8 tablespoons (1 stick) unsalted butter, divided
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2 tablespoons mixed or black peppercorns
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1 tablespoon kosher salt
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1 teaspoon dry mustard powder
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1/2 teaspoon dry thyme
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1/2 teaspoon garlic powder
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1 1/3 cup beef stock
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2/3 cup heavy cream
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3 tablespoons all purpose flour
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1/2 teaspoon kosher salt, divided
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1/4 teaspoon dry mustard powder
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1/4 teaspoon Worcestershire sauce
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pinch cayenne pepper