Instructions:
- Preheat oven to 400°F (200°C).
- Prepare the marinade:
- In a small bowl, mix Dijon mustard, olive oil, garlic, rosemary, thyme, balsamic vinegar (if using), salt, and pepper.
- Marinate the pork:
- Pat the pork tenderloin dry with paper towels.
- Rub the marinade all over the pork. Let it sit for at least 15 minutes (or refrigerate up to 24 hours for deeper flavor).
- Sear the pork (optional but adds flavor and color):
- Heat a skillet over medium-high heat. Add a bit of oil.
- Sear the pork on all sides until browned (about 2–3 minutes per side).
- Roast:
- Transfer the pork to a baking dish or oven-safe skillet.
- Roast in the oven for 20–25 minutes, or until internal temperature reaches 145°F (63°C).
- Rest and serve:
- Let the pork rest for 5–10 minutes before slicing.
- Slice and serve with roasted veggies, mashed potatoes, or a light salad.
Pro Tips:
- Add a drizzle of honey or maple syrup to the marinade for a sweet-savory contrast.
- For a sauce, deglaze the skillet with a splash of white wine or chicken broth after searing, then stir in a touch more Dijon and a dab of butter.