Cut off greens and pointed root ends of beets. If beets are large, cut in half or thirds. Rub beets with 1 tablespoon oil and place in a shallow baking dish. Add about 1/4 inch of water to the dish.
3
Cover tightly with foil and bake until tender throughout when tested with a skewer or knife, 45 to 60 minutes. When cool enough to handle, peel beets with a small knife and cut into 1/2 inch dice.
4
In a small bowl, thoroughly combine tangerine juice, green onion, chives, vinegar, salt and pepper. Add oil in a slow stream, whisking constantly until emulsified.