
Preheat the oven to 350?F.
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In a small mixing bowl, mix together the olive oil and Creole seasoning. Spread this evenly over the tenderloin. Heat a large ovenproof skillet over medium-high heat, then sear the tenderloin for 5 minutes on each side in the skillet. Transfer the skillet to the oven and roast for 25 minutes for medium-rare. Remove from the oven and let rest for 30 minutes.
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Cut the tenderloin into thin slices.
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In a small mixing bowl, combine the mayonnaise, horseradish, salt, and black pepper and whisk to mix. Cover and refrigerate until ready to use.
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In a medium-size mixing bowl, toss the arugula with the olive oil, salt, and pepper.
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Spread about 1/2 teaspoon of the horseradish mixture on each slice of toast. Top with a slice of beef and a few cheese shavings, then finish with a little of the arugula. Top each sandwich with a slice of toast. Pass on a platter to serve.
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Yield: 6 to 8 servings