Place the beets, carrots, apples, and fennel in a large roasting pan. In a small bowl, mix together the honey Dijon salad dressing, apple cider vinegar, olive oil, salt, and pepper. Pour the dressing mixture over the beets, apples, and fennel and mix well.
Roast in the oven for 3o mins to 1 hour or until the beets are tender (poke with a fork).
