Caramelized turnips and shallots

1 3/4 pounds white turnips, peeled and cut into 2 1/2 x 1 1/2 -inch pieces
1 3/4pounds golden turnips or rutabagas, peeled, cut into 2 1/2 x 1 1/2 -inch pieces
10 shallots (about 10 ounces), peeled, root end intact
2 tablespoons plus 2 teaspoons extravirgin olive oil
Coarse salt and freshly ground pepper
3/4 cup red-wine vinegar
2 bay leaves
6 sprigs fresh thyme
1/4cup packed light-brown sugar
3 tablespoons unsalted butter

Preheat the oven to 400F. Put turnips, shallots, and oil on a rimmed baking sheet. Season with salt and pepper; toss. Spread in a single layer. Roast until tender and golden brown, about 35 minutes.
Put vinegar, bay leaves, and thyme in a small saucepan. Bring to a simmer; cook until reduced by about half, about 10 minutes. Add sugar and ÿ teaspoon salt; stir to dissolve.
Add butter, and cook over medium heat until reduced to a syrupy glaze, about 10 minutes. Discard thyme. Pour over roasted vegetables; toss to coat. Serve immediately.

SERVES 12