Golden Beet and Sunflower Salad

Put oven racks in lower third and middle of oven and preheat oven to 425 °F. Trim beet greens, leaving 1 inch of stems attached. Tightly wrap beets together in double layers of foil to make packages (2 or 3 per package) and roast in middle of oven until tender, 40 to 45 minutes. Unwrap beets and cool slightly. While beets roast, toast sunflower seeds in a pie plate or a small baking pan in lower third of oven, shaking occasionally, until seeds are golden, about 10 minutes. Whisk together shallot, vinegar, salt, pepper, and sugar in a small bowl, then add oil in a stream, whisking. When beets are cool enough to handle, slip off and discard skins. Cut beets lengthwise into 1/4-inch-thick slices and gently toss with 3 tablespoons vinaigrette in a bowl. Toss sunflower sprouts and half of sunflower seeds with remaining vinaigrette in another bowl. Arrange beets on 6 salad plates and top with dressed sprouts. Sprinkle salads with remaining sunflower seeds.