Method:
Transfer juices and bits from roasting pan—turkey, pork, beef, lamb, chicken or roasted vegetables—to a bowl. (If bits are stuck, place the pan over medium-low heat and deglaze by adding a splash of broth and scraping them up.) Set bowl aside for a few minutes, and then skim fat from top and discard.
Melt butter in a large skillet over medium heat. Whisk in pan drippings and flour. Cook, stirring constantly, 1 minute.
Vigorously whisk in 1 cup broth until all lumps are gone, and then whisk in remaining broth. Bring to a boil, reduce heat to medium-low and simmer until thickened, 2 or 3 minutes.
Season to taste with salt and pepper.