Set the roasting pan over two burners on medium-high heat. Add 3/4 cup deglazing liquid, such as white wine, vermouth or brandy; bring to a boil and cook, scraping up the browned bits from the pan, until the liquid is reduced. Add 5 cups broth or stock. Increase the heat to high and return to a boil, whisking often and scraping up any remaining browned bits. Boil until reduced to about 2 3/4 cups, 8 to 12 minutes.