4 Red Beets, trimmed
Preheat oven to 350 degrees F. Wash beets and place in foil packets separated by color. Roast in oven until beets are tender, about 40 minutes.
Unwrap cooked beets and let cool slightly. Peel and slice cooked beets.
Mix oil and vinegar and season with salt and pepper.
In 3 quart size bags place the different colored sliced beets. Divide the oil and vinegar between the bags and allow the beets to marinate for a few hours. Can place in refrigerator if you will not use right away.
Arrange the beet rounds and orange rounds on a platter. Scatter scallions over the top.