Meanwhile, make the gravy. Pour turkey broth in measuring cup, you should have two cups. If not, add more stock to reach two cups. Turn on sauté setting and add butter or turkey fat to pot, melt, then sprinkle with flour. Whisk and cook for a minute or two until golden and flour taste is cooked off. Whisk in about a half cup of stock until smooth and thick, then gradually whisk in remaining stock. Cook a couple of minutes until thickened. Add optional dark soy sauce and taste for seasonings.