Make extra salad dressing and keep it in the refrigerator for up to 3 days; you’re gong to want it.
Preheat the oven to 400°F. In a small ovenproof casserole or roasting pan place the beets with 2 teaspoons of the olive oil, 1/4 teaspoon of the salt and 1/8 teaspoon of the pepper. Toss to coat well and push to 1 side of the pan in one layer. On another part of the roasting pan, toss the carrots with 2 teaspoon of the olive oil, 1/4 teaspoon of the salt and 1/8 teaspoon of the pepper. Transfer to the oven and roast, stirring occasionally, until the beets are crisp-tender, about 45 minutes. The carrots may be done earlier, so check occasionally (they're done when a fork can easily be inserted into the center). Let the vegetables cool to room temperature.