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1
Preheat oven to 375u00b0F. Trim green tops from beets; cut off stems and discard, reserving greens. Gently scrub 4 beets and set aside (reserve remaining beets for another use). Toss beets with 2 tablespoons oil in roasting pan. Sprinkle with salt. Cover pan with foil. Bake until beets are tender, about 50 minutes. Let beets stand covered at room temperature 20 minutes. Peel beets and cut into 1/2-inch cubes.
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2
Whisk creme fraiche, horseradish, lemon juice, and minced shallot in medium bowl. Add beets and toss to coat. Season to taste with salt and pepper. Let stand at room temperature at least 20 minutes. DO AHEAD
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3
Whisk 2 tablespoons olive oil, Dijon mustard, Worcestershire sauce, chopped rosemary, minced garlic, and ground black pepper in 13x9x2-inch glass baking dish. Add steak; turn to coat. Cover and chill at least 1 hour and up to 2 hours.
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4
Spray grill rack with nonstick spray. Prepare barbecue (medium-high heat). Remove steak from marinade; sprinkle with salt and pepper. Grill steak to desired doneness, about 5 minutes per side for medium-rare. Remove from grill; let stand 5 minutes.
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5
Meanwhile, heat remaining 2 tablespoons oil in heavy large skillet over medium-high heat. Add reserved beet greens; saute until wilted, about 3 minutes. Remove from heat, cover, and let stand 3 minutes.
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6
Thinly slice steak crosswise. Divide steak among 6 plates; surround with sauteed beet greens. Mound horseradish beets alongside.
