Gravy with Mushrooms and Onions

Grrrrrgh!
Course : Vegetables
From: HungryMonster.com
Serves: 3
 

Ingredients:

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
1 teaspoon salt -- to taste
1 teaspoon 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.