Dijon Pork Tenderloin with Sweet Onion Relish

The secret ingredient in this recipe comes from my mom.  Growing up she would make this for “family dinner” night and inevitably it would result in no leftovers and everyone asking for more.  Pork tenderloin was always one of my favorite dishes until I left home and had it in several restaurants and prepared by others not known as my mom.  Dry, bland, tough and disappointing.  It was never the same.

So, there was only one thing to do… I replicated my mom’s method and added a few of my own touches, and it’s now become a staple in my home.  Every time I make it the smells and flavors bring me back home to Sunday night dinners with my family.  It was our one night a week we would have a “proper” dinner, which my mom defined as, one, being in the “nice room”, two, using cloth napkins, and three, using double the plates (half of which didn’t go in the dishwasher).  I know because I was the designated plate dryer as my dad dunked them in scalding hot water and pass them to me with bright red fingers.  I dedicate this post to my family, and hope that it becomes a tradition in your home too.

Ingredients

  • Pork tenderloin
  • 2 tbsp. extra light olive oil
  • 2 tsp. mustard seeds
  • 2 tsp. fennel seeds
  • 1 tsp. salt
  • 1 tsp. fresh ground pepper
  • 1 tbsp. fresh rosemary, finely chopped
  • 3 tbsp. Dijon mustard

Topping

  • 1 yellow onion, sliced into thin strips
  • 3 cloves garlic
  • 1 tsp. extra light olive oil
  • 1 1/2 tsp. hot ground mustard (Colman’s British hot mustard powder)
  • 1 tsp. mustard seeds
  • Sprinkle of salt (to taste)
  • Sprinkle of freshly ground pepper (to taste)
  • 1 tsp. Worcestershire sauce
  • Splash of water or stock (if needed)
  • 1 tbsp. butter
  • 3 tbsp. fig jam

Method

  1. Preheat oven to 400°F
  2. Heat a large heavy bottom pan on stove on medium/high.  Add mustard seeds and fennel and tilt the pan so the oil lightly covers the bottom of the pan and all the spices
  3. While the oil heats up, sprinkle the pork tenderloin with salt, pepper and rosemary. Rub the spices into the meat so they don’t fall off when you drop it in the pan, it really helps flavor the tenderloin. This is your only time to season it, so if you don’t add it now it will be too late.
  4. Place tenderloin in hot pan and sear on all sides.  The mustard seeds and fennel will stick to the sides of the pork as it sears.
  5. Sear the pork, approximately 3 minutes per  side, and remove from pan.  Set in a roasting pan on a wire rack.
  6. Let it cool for a few minutes, and then spread a thick layer of Dijon mustard over the entire tenderloin.  You might need more than 3 tbsp. Just keep spreading it on so you cover the top.
  7. Place in oven and cook for 35-40 minutes
  8. While the meat cooks it’s time to make the topping!
  9. In the same skillet used to brown the meat, add sliced onions, garlic, salt and pepper and cook on medium/low until soft and translucent.  You may need to add a little more oil to avoid burning. 
  10. Add ground mustard, mustard seed, Worcestershire and a splash of water and continue to cook down for 10 minutes on low heat.
  11. You want to caramelize the onions, which is a slow and delicate process so be patient and let them cook down at a low heat.
  12. Add jam and butter and stir well.  Once it’s ready, cover leave on low heat.
  13. Check the pork with a meat thermometer.  Pork should reach 145°F
  14. If it’s under put it back in for 10-15 minutes and check again.  It depends on the thickness of the tenderloin, so it will vary every time.
  15. Once the meat has reached the right temperature remove from oven and let cool for 5-10 minutes before slicing so the meat juices have time to redistribute.  If you cut it right away all the juice will run out of the meat and give you a very dry piece of tenderloin.
  16. Slice pork and top with sweet onion sauce

This pork is flavorful enough to eat on it’s own, or add a topping, or just a simple spoonful of applesauce.  The spicy mustard keeps the pork moist and adds the perfect amount of heat to the delicate tenderloin.

Below is an alternate topping my loving boyfriend made for the following evening.  The dates disintegrated in the warm sauce resulting in a sweet jam like marmalade.

Alternate Topping

  • 1 onion, diced
  • 5 cloves garlic, diced
  • 2 jalapenos, diced
  • 6 dates, chopped
  • 1 cup chicken stock
  • 1 tbsp. brown sugar
  • Sprinkle of salt (to taste)
  • Sprinkle of freshly ground pepper (to taste)
  • 1 tbsp. butter

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One Comment to “Dijon Pork Tenderloin with Sweet Onion Relish”

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