6. To finish the roasted vegetables, put about 1/2 cup of the reserved drippings from the bowl into another large roasting pan and put into oven until fat is hot. Meanwhile, put flour and salt and pepper to taste into a large, wide bowl. Dredge potatoes, carrots, and parsnips in seasoned flour, shaking off excess. Remove pan from oven, add flour-coated vegetables, and turn to coat in the fat. Return pan to oven and roast vegetables, turning several times, until golden, 30-45 minutes.