Preheat the oven to 425ºF. Line a rimmed baking sheet with foil.
Place carrots on prepared baking sheet and toss with olive oil, salt and pepper. Roast carrots, stirring occasionally, until they begin to brown and become tender, about 30 minutes.
Drizzle the vinegar over the carrots and stir. Return carrots to oven and roast until most of the vinegar is evaporated, about 5 minutes longer. Serve warm.
