Step 1

Preheat oven to 400 degrees F. Whisk vinegar, maple syrup and 1 tablespoon oil in a small bowl; set aside.

Step 2

Combine carrots, salt and the remaining 1 tablespoon oil in a large bowl; toss to coat. Spread in a single layer on a rimmed baking sheet.

Step 3

Roast the carrots until starting to brown and almost tender but not completely cooked through, 16 to 18 minutes. Drizzle the balsamic mixture over the carrots, and, using a spatula, toss to coat completely. Continue roasting until the carrots are tender and glazed, about 5 minutes more. Sprinkle with toasted hazelnuts, if desired. Serve immediately.