Tenderloin with Creamy Garlic Sauce Recipe

In a blender, combine half of the mustard, eight garlic cloves and 1 tablespoon peppercorns; cover and process for 1 minute, scraping sides occasionally. Add 1 tablespoon oil; process until a paste forms. Spread over beef. In a large skillet, heat the remaining oil over medium-high heat. Brown beef, one piece at a time, on all sides. Place in a shallow roasting pan coated with cooking spray. Bake,uncovered, at 400 ° for 25-45 minutes or until meat reaches desired doneness (for medium-rare, a meat thermometer should read 145 °; medium, 160 °; well done, 170 °). Remove to a warm serving platter. Let stand for 10-15 minutes. Meanwhile, mince remaining garlic. In a saucepan, combine garlic, whipping cream, sour cream and remaining mustard and peppercorns. Cook and stir over low heat until heated through. Slice beef; serve with the sauce.