Turkey Gravy

1. Bring 4 cups turkey stock to a boil in medium pot.  Remove from heat, keep warm
2. Melt 4 TBSP unsalted butter in a saucepan over medium heat.  Whisk in 1/4 cup all-purpose flour.  Whisk until it turns golden brown and smells slightly toasted.
3. Gradually whisk in the turkey stock, bring to a boil, then reduce to a simmer.
4. Add 2 bay leaves or 1 sprig thyme.  Toss in some umami flavor with porchini mushrooms and 2 TBSP madiera wine.  Season with salt