Wild Mushroom Pasta

From the food network show "Private Chefs of Beverly Hills"

• Ready In: 1 hr
• Serves: 4-6

Ingredients

• 5  tablespoons butter
• 3  tablespoons flour
• 1  onion, roughly chopped
• 3⁄4 lb cremini mushrooms or 3⁄4 lb  dark  wild mushroom, chopped
•  kosher salt & freshly ground black pepper
• 2  garlic cloves, minced
• 3  cups  chicken stock or 3  cups  vegetable stock
• 3⁄4 cup pistachio nut, roughly chopped, plus additional for garnish
• 1  teaspoon  chili flakes
• 3  tablespoons  extra-virgin olive oil
• 1  lb  your favorite pasta
•  grated parmesan cheese or   pecorino cheese

Directions

1. In large skillet over medium-high, add 3 T butter and saute the onions until lightly browned, about 7 minutes. Add mushrooms, and salt and pepper, to taste, and cook for 3 minutes. Stir in the garlic and cook for another 2 minutes, then reduce the heat to medium. Add another 2 T of butter and the flour. Stir until a paste forms around the veggies. Add the stock slowly, bit by bit, stirring until its easy to add a large amount without clumping. Simmer until reduced by half and thick. Stir in the pistachio nuts, chili flakes and oil, and season, to taste, with salt and pepper. Set aside.
2. In a separate pot, cook your favorite pasta (penne, pappardelle etc.) according to package instructions. Put the pasta in the center of each white plate and spoon some sauce over the top. Garnish with some grated cheese, and a sprinkle of chopped pistachios.