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Slow Cooker Pork Tenderloin with Rich Red Port Sauce: An Easy, Foolproof Recipe

As a seasoned home cook who's mastered countless slow cooker meals, my first try with pork tenderloin was an absolute hit. This version pairs juicy medallions with a luxurious red port sauce—and I'll soon experiment with a creamy mushroom variation. Slow-cooked pork tenderloin delivers unbeatable tenderness and flavor every time.

Next, I'll whip up that mushroom cream sauce; it promises to be equally delicious.

Ingredients for Slow Cooker Pork Tenderloin (Serves 4-5)

  • 3 pork tenderloins
  • 1 bunch spring onions
  • 4 cloves garlic
  • 100 ml beef stock
  • 300 ml port (tawny)
  • 2 bay leaves
  • 4 sprigs thyme

Pro tip: Toss the thyme sprigs straight into the slow cooker—no need to strip the leaves, saving you valuable prep time.

I lightly browned the tenderloins first for that appealing sear and color on the medallions, though it's optional. (Our slow cooker Brussels sprouts are another must-try side!)

Step-by-Step Preparation

  • Slice spring onions into thin rings.
  • Briefly sear pork tenderloins (1-2 minutes), then slice into even medallions.
  • Add onions to slow cooker and squeeze garlic over them.
  • Layer in pork medallions.
  • Add bay leaves in a tea infuser.
  • Pour in stock and port.
  • Top with thyme sprigs.

Note: Medallions need just 4 hours on low—don't overcook. Whole tenderloins may take slightly longer.

Your pork tenderloin is now perfectly tender and ready to serve!

Elevate the Red Port Sauce

For an even richer, thicker sauce, finish with these expert steps before serving:

  • Remove sauce from slow cooker.
  • Strain out onion bits for smoothness.
  • Transfer to a saucepan.
  • Whisk in cornstarch slurry (cornflour mixed with cold water) to thicken, stirring constantly.
  • Stir in extra port for vibrant color.
  • Finish with a pat of (cream) butter for silky texture.
  • Pour back over medallions in the cooker.
  • Dig in!

Serving suggestion: Pair with simple celeriac puree for a comforting match. Also try our Eastern-style slow cooker pork tenderloin for variety.