Preheat oven to 300 F. Place roast in roasting pan. Rub with garlic. Sprinkle with seasonings. In bowl, whisk together the root beer and mushroom soup. Pour over roast. Sprinkle with onion soup. Bake covered 4 hours. Add carrots, onions; cover. Bake 1 more hour.
Cajun Country -- New Iberia, Louisiana