Preheat oven to 400 degrees. Slice off the tops and bottoms of each beet, and peel each beet with vegetable peeler. Cut the beets into uniform size of your liking - 1 to 1.5 inch chunks. Place cut beets in bowl and toss with olive oil, thyme, salt and pepper. Spread out on oiled cookie sheet. Roast for 35 minutes or so, checking periodically to stir them around. Remove from oven and throw back into your prep bowl and toss with vinegar the the juice from one orange and zest. Sprinkle with salt and pepper. Can serve warm or room temp, with or without greens and your choice of cheese. Perfect on their own too!