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PREPARE THE FILLET:
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Preheat oven to 400u00b0F.
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Allow beef to come to room temperatue, about 30 minutes.
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In a small bowl, stir together the green peppercorns, tarragon, chopped green onions, garlic, & 1/2 teaspoon salt.
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Spread the mixture out on a plate or platter large enough to hold the beef.
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Brush 1 tablespoon of the olive oil on all sides of the beef fillet.
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Roll the fillet in the green peppercorn mixture, pressing lightly so that it adheres to the surface.
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In a large, ovenproof nonstick frying pan over high heat, warm the remaining 2 tablespoons of olive oil.
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Add the beef and sear until browned on all sides, 3-4 minutes.
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Place in the oven and cook until an instant read thermometer, inserted in the thickest part of the fillet registers 120u00b0F(54u00b0C)for medium rare 8-10 minutes.
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Transfer the beef to a piece of aluminum foil and let cool to room temperature. Wrap the beef in the foil and refrigerate for at least 4 hours up to overnight.
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PREPARE THE BAGUETTE:
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Reduce the oven temperature to 300u00b0F. Arrange the baguette slices in a single layer on a rimmed baking sheet.
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Place in the oven and toast, truning occasionally, until golden brown on both sides, 15-20 minutes total.
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Remove from the oven and let cool.(The toasts can be stored in an airtight container at room temperature overnight).
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PREPARE THE HORSERADIH CREAM:
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In a small bowl, whisk together the cream cheese, horseradish, and red pepper flakes, if using.*(The cream can be stored in the refrigerator overnight; bring to room temperature before using, the longer you let it marry the better it will to taste.).
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TO ASSEMBLE:
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Remove the beef from the refrigerator, unwrap and slice against the grain as thinly as possible. (Slice when it is cold and you'll be able to slice it even thinner).
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Spread an equal amount of the horseradish cream on each of the toasts.
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Place a slice or two of beef on top of the cream cheese.
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Garnish each canape with a few slices of green onion.
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Arrange the canapes on a doily or festive napkin-lined tray and serve immediately.
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Enjoy with some bubbly!