I found this recipe on the So Much Food Blog. Instead of cooking the tenderloin whole, I cut it into cubes. This dinner received a thumbs-up from the other side of the table. I recommend reading the original post on the So Much Food Blog. It has helpful tips on preparing this recipe.
This is my version of the recipe. It makes enough for just two people. You want to be sure you have at least two hours if not more, to marinade the pork.
Ingredients-
1 lb pork tenderloin
1 tablespoon Dijon mustard
1/4 cup olive oil
2 teaspoons aged balsamic vinegar
1 tablespoon minced fresh rosemary leaves
1 tablespoon minced fresh sage leaves
1 1/2 teaspoons kosher salt
1/2 teaspoon ground black pepper
Method-
Mix the marinade.
Whisk together the olive oil, dijon, garlic, rosemary, sage, balsamic, salt, and pepper until smooth.
Reserve 2 tablespoons of the marinade and set aside.
Prep the pork.
Start by using a sharp knife to trim away any silver skin.
Cut the pork into 2” cubes
Marinate the pork.
Place the pork in a ziplock bag or baking dish and coat with the marinade.
Transfer to the fridge and marinate for at least 2 hours, up to overnight.
Preheat the oven to 400 F.
Sear the pork.
Heat two tablespoons of the olive oil in a large cast iron skillet or braiser over medium-high heat.
Remove the pork from the marinade and shake off any excess marinade.
Sear the pork for a couple minutes on all sides until browned.
Once browned, transfer to a plate and turn off the heat.
Season the potatoes.
Toss the potatoes with half of the reserved marinade plus one tablespoon of olive oil.
Season with salt and pepper and toss well.
Spread the potatoes in an even layer in the skillet or braiser.
Transfer to the oven for 10 minutes.
Remove the skillet or braiser from the oven.
Place the pork on top and return to the oven.
Roast the pork. Roast the pork for 10-15 minutes, until an internal temperature registers between 145 F and 150 F.
Let the pork rest before slicing.
Serve the roast pork tenderloin with potatoes.