Roasted Beef Tenderloin with Mushrooms and White Wine Cream Sauce.

Bahan-bahan (8 porsi)

• 1 (4-5) pound whole beef tenderloin, trimmed of fat
• 2 tablespoons dijon mustard
• 1/4 cup peppercorns, crushed, or fresh balck pepper
• kosher salt
• 16 ounces cremini mushrooms, halved
• 1 tablespoon extra virgin olive oil
• 4 tablespoons salted butter
• 1/2 cup white wine ((or chicken broth))
• 2 tablespoons salted butter
• 2 teaspoons chopped fresh thyme
• 2 cups heavy cream or whole milk
• 1/3 cup grated parmesan
• kosher salt and pepper