Rub beef tenderloin with olive oil. Season with salt, pepper, garlic land parsley. Wrap roast with plastic wrap and marinate in refrigerator at least 4 hours or overnight. Preheat oven to 425. Put meat in shallow baking pan. Roast 45 minutes or until meat thermometer reaches 130 for rare. Let stand 5 minutes before carving. Meanwhile, make the Portobello Mushroom Sauce; serve with sauce.
Portobello Mushroom Sauce: In skillet, cook 2 pkg. sliced Portobello mushrooms in 3 Tbsp. unsalted butter; set aside. Add 1/2 cup red wine or beef broth and 1/2 cup oven roasted garlic and onion sauce; heat gently. Remove from heat and stir in 1/2 cup heavy cream. Serves 8