HEAT oven to 350°F.
PLACE meat in roasting pan sprayed with cooking spray; brush with 1/2 cup dressing. Toss potatoes and beets with 2 Tbsp. of the remaining dressing; spoon around meat. Bake 15 min.
TOSS onions and carrots with remaining dressing. Add to ingredients in roasting pan.
BAKE 1 hour 30 min. or until meat is done (160°F), basting occasionally with pan juices. Let stand 10 min. before slicing meat. Serve with the cooked vegetables.