INGREDIENTS
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One 8-ounce filet mignon
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Kosher salt and freshly ground black pepper
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1 tablespoon unsalted butter
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2 tablespoons prepared horseradish, drained
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2 tablespoons mayonnaise
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2 tablespoons sour cream
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Sixteen 1/4-inch-thick slices baguette, lightly toasted (about 1/2 baguette)
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Flaky sea salt, for serving
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Fresh chives, cut into 1 1/2-inch segments (about 1/4 cup)