After-Thanksgiving Turkey Soup

1 leftover turkey carcass (from a 12- to 14-pound turkey, or whatever size you have)

Vegetables - Use mixture of vegetables, perhaps the ones below, to equal 4 cups

3 medium onions, chopped

2 large carrots, diced

2 celery ribs, diced

1 cup butter or oil or fat

1 cup all-purpose flour (or 1/2 cup cornstarch or 1/4 arrowroot powder dissolved in 2 cups cold water or cold broth)

2 cups half-and-half cream or milk or cream (or 2 cups broth)

1 cup uncooked long grain rice (if you cook this separately and add it as you serve each bowl, then you can increase your veggies up to another 4 cups)

2 teaspoons salt, opt.

3/4 teaspoon pepper, opt.