A wonderful marinade with incredible results – a little red wine, soy sauce and a touch of brown sugar – amazing results. This is just too easy to produce such a flavorful tenderloin – Pork Tenderloin with Mustard Sauce. We have several mustard sauce recipes and this one rates with the best of them, a little heat from the mustard powder and a very nice compliment to the flavorful tenderloin. Enjoy.