To make gravy, pour drippings from roasting pan into bowl, leaving particles in pan. Return 1/2 cup drippings to roasting pan. (Measure accurately because too little fat makes gravy lumpy.) Using wire whisk, stir in flour. Cook over medium heat, stirring constantly, until mixture is smooth and bubbly. Gradually stir in remaining 2 cups drippings. Heat to boiling over high heat, stirring constantly. Continue boiling 1 minute, stirring constantly. Stir in a few drops browning sauce. Add salt and pepper to taste.