Cast Iron Pork Tenderloin is smothered in Dijon mustard and fresh herbs, seared in a cast iron skillet, and transferred to the oven to finish cooking. I made this recipe a one-pot meal by adding chopped baby potatoes and carrots to the skillet!
Pork tenderloin is a lean, mild, and tender cut of meat. It pairs well with all side dishes and cooks up in a snap! Even this decadent pork tenderloin medallions with Dijon cream sauce recipe cooks in just 30 minutes!
Cooking pork tenderloin in cast iron allows you to get a golden brown and flavorful sear on the outside of the tenderloin. Then, there's no need to dirty another dish! You transfer the skillet straight to the oven to finish cooking.
Cooking in cast iron is one of my favorite ways to cook! If you're looking for more cast-iron recipes then you need to make my Cast Iron Skillet Chicken Breast, Blackened Pork Chops, and any of my Dutch Oven recipes!
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Why You'll Love this Recipe
- The hands-on prep time for this recipe is 15 minutes or less.
- My recipe for pork tenderloin in cast iron is a one-pot meal (similar to this baked chicken, potato, and carrot recipe) because I have you add baby potatoes and chopped carrots before it goes into the oven.
- This dinner recipe presents beautifully. It's full of bright colors and can be garnished with leftover fresh herbs. If you're looking for an easy, delicious dinner to serve to guests, THIS IS IT.
- If you're feeding several adults, you can easily double this recipe by cooking a second tenderloin in the same pan.
- Pork tenderloin is perfect for those picky kiddos who only want to eat plain, white, chicken breast. Pork tenderloin has a mild flavor that is very similar to chicken!
Ingredients
- Pork tenderloin: Try to find a pork tenderloin that is around 2 pounds. Pork tenderloin is a long, narrow, boneless, extra-lean, cut of meat. Don't confuse pork tenderloin with pork loin! Pork loin is wide, flat, and thick. Pork loin can be bone-in or boneless, and also has a layer of fat over the top called a fat cap.
- Potatoes and carrots: Baby potatoes and peeled carrots are chopped, seasoned with kosher salt, and added to the cast iron skillet right before it gets transferred into the oven.
- Dijon mustard: Dijon mustard and extra virgin olive oil are mixed together and smothered over the entire tenderloin before coating it in fresh herbs. Look for a smooth and strongly flavored Dijon mustard. I like Maille Dijon Mustard.
- Fresh herbs: Fresh thyme and fresh rosemary are combined with kosher salt, black pepper, and garlic powder before they're sprinkled over the entire pork tenderloin.
Equipment Needed
I'm sure it doesn't come as a surprise that in order to make a pork tenderloin in cast iron, you'll need a cast-iron skillet! I like to use my non-enameled, 12-inch Lodge Cast Iron pan.
Step-by-Step Instructions
Step 1: Chop the baby potatoes and carrots into bite-sized pieces. You want the potatoes and carrots to cook just as quickly as the pork does, so you'll need them chopped pretty small.
Add them to a glass bowl, drizzle with olive oil, and season with kosher salt.
Step 2: Remove the silver skin from the pork tenderloin. Silver skin is tough connective tissue that doesn't caramelize or melt like fat does. It's hard to chew and flavorless. You'll definitely want to remove it.
The silver skin is only on one side of the tenderloin. It's a small white/grey patch that runs about ½ of the way down the tenderloin.
Step 3: Use a sharp knife to cut the silver skin off. You'll need to angle your knife down into the tenderloin and fully cut the patch away. It won't easily just pull off.
Step 4: Mix the Dijon mustard and 1 tablespoon of extra virgin olive oil together in a small bowl. In a separate small bowl, combine the kosher salt, black pepper, garlic powder, fresh thyme, and fresh rosemary.
Step 5: Smother all sides of the pork tenderloin with the mustard and olive oil blend. Sprinkle the dried and fresh herbal seasoning blend on all sides of the tenderloin.
Step 6: Transfer the pork tenderloin to a hot cast iron skillet over medium heat. Brown all sides of the tenderloin for about 2 minutes per side.
Step 7: Add the potatoes and carrots to the hot skillet. Transfer the cast iron skillet to your preheated oven. Cook the Cast Iron Pork Tenderloin for 20 minutes at 400°F.
Step 8: After 20 minutes, check the internal temperature of the pork using an instant-read thermometer. You should cook pork tenderloin to an internal temperature of at least 145°F. I like to cook my tenderloin to 150°F. Continue cooking your tenderloin as needed.
Depending on the size of your pork, it could take up to 30 minutes to fully cook. If the roasted pork tenderloin fully cooks before the potatoes and carrots, remove the cooked pork tenderloin from the pan and continue cooking the potatoes and carrots until they're fork-tender.
Let the pork rest for at least 10 minutes before slicing it into rounds. Serve your oven-roasted pork with the roasted vegetables and enjoy!
Substitutions and Variations
- Vegetables: Any root vegetable that holds up well to roasting can be used in place of potatoes and carrots. If you'd like to make this recipe low-carb, you can completely eliminate the potatoes. I think parsnips, turnips, beets, garlic, and onions would all be delicious.
- Fresh herbs: I chose to use fresh rosemary and fresh thyme. Fresh sage, parsley, chives, and green onions would also be delicious additions.
How to Store, Freeze, and Reheat
- How to store: Store leftover tenderloin in a glass, airtight container in the refrigerator for up to 3 days.
- How to freeze: Pork roasts can be frozen for up to two months. Wrap the cooked roast tightly in plastic wrap and then store it in a freezer-safe plastic bag.
- How to reheat: Reheat pork in the oven at 325°F. Place the tenderloin in a baking dish, cover the dish with aluminum foil, and warm until heated through.
Frequently Asked Questions
Pork tenderloin can be cooked in the oven, air fryer, instant pot, slow cooker, and on the grill. Pork tenderloin is best cooked at a higher temperature for a short amount of time. This means the oven and the grill are the two best ways to cook pork tenderloin.
Pork tenderloin is a leaner cut of meat, which means it's low in fat. Lean cuts of meat are best cooked quickly at higher temperatures.
You do not need to cover pork tenderloin. Baking pork tenderloin uncovered will give it more of a crisp crust on the outside.
More Recipes to Consider
If you tried this recipe for Cast Iron Pork Tenderloin or any other recipe on my blog, please leave a 🌟 star rating and tell me how it went in the 📝 comments below. Thanks for visiting!
Cast Iron Pork Tenderloin with Potatoes and Carrots
Ingredients
- 2 pound pork tenderloin 1 tenderloin
- 1 pound baby potatoes
- ½ pound carrots
- 3 tablespoons extra virgin olive oil divided
- 1 teaspoon kosher salt divided
- 1 tablespoon Dijon mustard
- 2 teaspoons fresh thyme chopped
- 2 teaspoons fresh rosemary chipped
- 1 teaspoon garlic powder
- ¼ teaspoon ground black pepper
Instructions
- Preheat your oven to 400°F.
- Chop the baby potatoes and carrots into bite-sized pieces. You want the potatoes and carrots to cook just as quickly as the pork does, so you'll need them chopped pretty small. Add them to a glass bowl, drizzle with 1 tablespoon of olive oil, and season with ½ teaspoon of kosher salt.
- Remove the silver skin from the pork tenderloin. Silver skin is tough connective tissue that doesn't caramelize or melt like fat does. It's hard to chew and flavorless. You'll definitely want to remove it. The silver skin is only on one side of the tenderloin. It's a small white/grey patch that runs about halfway down the tenderloin. Use a sharp knife to cut the silver skin off. You'll need to angle your knife downward into the tenderloin and fully cut the patch away.
- Mix the Dijon mustard and 1 tablespoon of extra virgin olive oil together in a small bowl.
- In a separate small bowl, combine the rest of the kosher salt, fresh thyme, fresh rosemary, garlic powder, and black pepper.
- Smother all sides of the pork tenderloin with the mustard and olive oil blend. Sprinkle the dried and fresh herb seasoning blend on all sides of the tenderloin.
- Heat the remaining tablespoon of olive oil in a cast iron skillet over medium heat. Transfer the pork tenderloin to the hot skillet. Brown all sides of the tenderloin for about 2 minutes per side.
- Add the potatoes and carrots to the hot skillet. Transfer the cast iron skillet to your preheated oven. Cook the pork tenderloin and vegetables for 20 minutes at 400°F.
- After 20 minutes, check the internal temperature of the pork using an instant-read thermometer. You should cook pork tenderloin to an internal temperature of at least 145°F. I like to cook my tenderloin to 150°F. Continue cooking your tenderloin as needed. Depending on the size of your pork, it could take up to 30 minutes to fully cook. If the pork fully cooks before the potatoes and carrots, remove the cooked pork tenderloin from the pan and continue cooking the potatoes and carrots until they're fork-tender.
- Let the pork rest for at least 10 minutes before slicing it into rounds. Serve your oven-roasted pork with the roasted vegetables and enjoy!
Nutrition
Notes
- The nutrition information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for professional medical advice.
- Try to find a pork tenderloin that is around 2 pounds. Pork tenderloin is a long, narrow, boneless, extra-lean cut of meat. Don't confuse pork tenderloin with pork loin! Pork loin is wide, flat, and thick. Pork loin can be bone-in or boneless and may have a layer of fat on the top called a fat cap.
- See the blog post above for photos and tips on removing the silver skin.
Dave Follett says
Just found your recipe. Thank you. Gonna do it tomorrow or Tuesday 05/7/2025. Can I slice the tenderloin before I cook it?
Katie Youngs says
Hi Dave - I think if you slice the pork before cooking it, you'll have issues getting the herbed mustard to stick to the sides. I've never tried it this way, that's just my best guess! I do have a pork tenderloin recipe where I slice it beforehand and pan-fry each slice. You can check it out here, https://sugarandsnappeas.com/pork-tenderloin-medallions/ and take a look at that cooking method.
Carole says
Loved this recipe (especially since it only uses one pan). Added Herbes de Provence to the veggies and cooked for 40 minutes. Pork was so tender!
Katie Youngs says
I'm so happy you loved it Carole! Thank you so much for leaving a review. I need to try cooking with Herbs de Provence more often. It's not a blend that I commonly think to use.
Katie says