1. Prepare the Pork
Pat the pork tenderloin dry with paper towels.
This helps the seasonings stick to the surface.
Trim away any excess silver skin or tough connective tissue, but leave a small amount of fat if present for flavor.
2. Make the Seasoning Mixture
In a small bowl, combine the garlic, Dijon mustard, honey, thyme, rosemary, paprika, onion powder, salt, and black pepper.
Add the olive oil and stir until you have a thick, fragrant seasoning paste.
Rub the mixture generously over all sides of the pork.
3. Layer the Slow Cooker
Arrange the sliced onion across the bottom of the slow cooker.
Place the seasoned pork tenderloin on top.
Pour the broth around the pork rather than directly over the top so you don’t wash away the seasoning.
If you’re using Worcestershire sauce or apple cider, add it to the broth.
4. Slow Cook
Cover and cook on LOW for approximately 3–4 hours, depending on the size and thickness of your tenderloin and the performance of your slow cooker.
Because pork tenderloin is a relatively lean cut, avoid automatically cooking it for an entire day. Overcooking can make it dry rather than tender.
The most reliable way to determine doneness is with an instant-read thermometer.
For whole cuts of pork, the USDA recommends a minimum internal temperature of 145°F (63°C), followed by a three-minute rest.
5. Let the Pork Rest
Once the pork reaches the appropriate temperature, remove it from the slow cooker.
Place it on a cutting board and let it rest for about 5–10 minutes before slicing.
Resting gives the juices time to redistribute throughout the meat.
6. Slice and Serve
Slice the tenderloin into rounds and spoon some of the flavorful onions and cooking juices over the top.
For an especially attractive presentation, arrange the slices on a serving platter and garnish with fresh herbs.
Should You Brown the Pork First?
You don’t have to, but it’s a wonderful optional step.
Before placing the tenderloin in the slow cooker, heat a skillet over medium-high heat and sear the pork in a little oil for about 1–2 minutes per side.
This creates additional browning and savory flavor.
It does add another pan to clean, though, so feel free to skip it when convenience is the priority.
How to Keep Pork Tenderloin Juicy
Pork tenderloin is naturally lean, so the biggest mistake is overcooking it.
Keep these tips in mind:
- Use a meat thermometer rather than relying only on cooking time.
- Don’t cook it much longer than necessary.
- Allow the pork to rest before slicing.
- Don’t slice it too thinly while it’s piping hot.
- Keep some of the cooking juices for serving.
The slow cooker provides moisture, but it can’t prevent lean pork from becoming dry if it stays at a high internal temperature for too long.
Easy Gravy From the Cooking Liquid
Don’t throw away those flavorful juices!
Pour the cooking liquid into a small saucepan and bring it to a gentle simmer.
For a thicker gravy, mix:
- 1 tablespoon cornstarch
- 2 tablespoons cold water
Stir until smooth, then whisk the slurry into the simmering liquid.
Continue cooking until the sauce thickens.
Taste and adjust the seasoning before spooning it over the sliced pork.
What to Serve With Pork Tenderloin
This pork is incredibly versatile.
For a classic comfort-food dinner, serve it with:
- Creamy mashed potatoes
- Roasted carrots
- Green beans
- Steamed broccoli
- Buttered noodles
- Cornbread
- Dinner rolls
For a lighter meal, pair it with a crisp green salad and roasted vegetables.
The savory cooking juices are especially delicious spooned over mashed potatoes.
Delicious Variations
Apple-Herb Pork
Add sliced apples and a splash of apple cider to the slow cooker.
The natural sweetness of the apples pairs beautifully with pork.
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