Preheat oven to 425 degrees F. Cut tops off beets and trim root ends. Wash beets and greens. Wrap each beet in foil. Place on a baking sheet. Coarsely chop 3 cups of the beet greens; set aside. (Reserve any remaining greens for another use.) Bake beets 1 to 1 1/2 hours or until tender. Remove foil; let beets cool 15 minutes. To remove skins, wrap beets, one at a time, in a paper towel and gently rub off the skins. Cut beets into bite-size pieces.