Preheat oven to 350F. Wrap beets in double thickness of foil. Roast beets on oven rack until tender, about 1 hour 45 minutes. Unwrap beets and cool. Whisk oil, vinegar, salt and pepper in medium bowl until blended. Mix in onion and horseradish. Peel beets; cut into 1/3-inch dice. Add to onion mixture. Cover; chill 1 to 4 days. Makes 4 cups Bon App?tit April 1997 Per serving: 964 Calories; 108g Fat (99% calories from fat); 0g Protein; 3g Carbohydrate; 0mg Cholesterol; 1881mg Sodium NOTES : Epicurious. Start preparing this at least a day ahead. Posted to MC-Recipe Digest by shade on Apr 13, 1998