Preheat oven to 350 F. Remove outer papery skin from garlic bulbs, but don't seperate or peel individual cloves. Place garlic bulbs in a small baking disk. Drizzle with oil. Sprinkle with thyme, pepper and salt. Add stock. Cover and bake until garlic is tender, basting occasionally with stock, about one hour. Uncover and bake until garlic is very tender, about 15 minutes more. Press the roasted garlic clove from the skins onto bread slices and spread like butter. Serve cooking liquid for dunking bread. Makes 12 servings