Method for Giblet Stock: Place all ingredients in 3-quart saucepan; add enough water to cover. Heat to boiling; reduce heat to low. Cover and simmer1 hour. Strain the stock through colander or wire strainer, discarding giblets, neck and onion. Refrigerate until need to make gravy.
Method for Apple Cider Gravy: Pour drippings (turkey juices and fat) from roasting pan into 4-cup measuring cup, leaving brown bits in pan. Add enought Giblet Stock to drippings to measure 3 cups; pour into 3-quart saucepan and set aside. Pour apple cider into roasting pan; cook over medium heat, stirrin constantly, until all browned bits are released. Transfer cider mixture to liquid in 3-quart saucepan. Heat to boiling over medium-high heat. Beat flour and water in small bowl with wire whisk until well blended. Beat flour mixture into boiling liquid, using wire whisk; continu boiling and whisking 1 minute. Stir in salt and pepper.