Step 4
Make the gravy
Pour the drippings from the turkey roasting pan into a fat separator and allow the fat to rise to the top. Transfer 1/4 cup of the fat to a 3- to 4-quart saucepan; discard the remaining fat and add the defatted drippings to the reserved broth in the measuring cup.
Add the wine to the roasting pan and boil over medium-high heat, scraping up any browned bits from the bottom of the pan, until reduced to 1/2 cup, about 10 minutes. Strain through a medium-mesh sieve set over the measuring cup of broth.
Add the reserved butter to the fat in the saucepan and melt over medium-high heat.
Add the mushrooms and cook, stirring often, until browned and tender, about 8 minutes. Add the flour and cook, whisking constantly, until slightly thickened, 3 to 4 minutes. Slowly whisk in the broth mixture and bring to a boil; then turn the heat down and simmer vigorously, whisking occasionally, until the gravy is reduced to 5 cups, 8 to 16 minutes. Season to taste with salt and pepper.
Carve the turkey and serve with the hot gravy.