INGREDIENTS
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1 2-pound beef tenderloin, trimmed and tied
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2 tablespoons extra-virgin olive oil
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3 onions, finely diced (about 6 cups)
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1 cup dry white wine
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2 leeks (about 1 pound), trimmed and halved lengthwise
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1 turnip (about 7 ounces), peeled and cut into 1-inch wedges
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1/2 rutabaga (about 8 ounces), peeled and cut into 3/4-inch wedges
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4 small potatoes, peeled and halved crosswise
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Coarse salt and freshly ground pepper
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1/4 cup jarred prepared horseradish and beets, for serving