Preheat oven to 375 degrees F.
Mix together the onion, rutabaga, and carrots. Season with salt and pepper.
Dress liberally with olive oil and place in a roasting pan; roast in a pre-heated oven for 30-35 minutes until the vegetables start to get tender.
Add the orange juice, zest, orange segments, and maple syrup; combine well. Continue to bake until vegetables are fork tender, and the juices have reduced and coated the vegetables.
Sprinkle with chopped parsley before serving.