INGREDIENTS
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1 1/2 to 2 pounds fillet of beef, trimmed and tied
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1 tablespoon unsalted butter, at room temperature
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Kosher salt and coarsely ground black pepper
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2 French baguettes, 18 to 20 inches long
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3 ounces black truffle butter, at room temperature
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1 (2-ounce) chunk good Parmesan cheese
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Fresh baby arugula