Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/4  cup           butter
   1      large         onion -- halved, sliced thin
     1/2  pound         mushrooms -- sliced
     1/4  cup           fat (from turkey) or butter
     1/4  cup           flour
   3      cups          turkey juices plus chicken stock
                        salt -- to taste
                        pepper -- to taste

Preparation:

Heat butter in a wide skillet. Add onion and mushrooms and sauté until browned. Remove and reserve. In a saucepan, heat fat separated from roasting juices or butter. Add flour and stir until blended. Cook for a few minutes, stirring constantly. Slowly whisk in 2 cups of pan juices and stock. Cook and stir until gravy is smooth. Simmer 5 minutes. Add more stock if needed to thin mixture. Salt and pepper to taste. Add reserved mushrooms and onions.