Holiday Turkey Soup

1 turkey carcass
4 quarts water
1 cup butter
1 cup all-purpose flour
3 onions, chopped
2 large carrots, diced
2 ribs celery, diced
1 cup long-grain rice (raw)
2 teaspoons salt
3/4 teaspoon pepper
2 cups half-and-half

Place turkey carcass and water in a large Dutch oven; bring to a boil. Cover, reduce heat, and simmer 1 hour. Remove carcass from broth, and pick meat from bones. Set broth and meat aside. Measure broth; add water if necessary to measure 3 quarts. Heat butter in large Dutch oven; add flour, and cook over medium heat, stirring constantly, 5 minutes. (Roux will be a very light color.) Stir onion, carrot and celery into roux; cook over medium heat 10 minutes, stirring often. Add broth, turkey, rice, salt, and pepper; bring to a boil. Cover, reduce heat, and simmer 20 minutes or until rice is tender. Add half-and-half, and cook until thoroughly heated. Yield: 4 1/2 quart