Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Chop the broccoli into small florets, slice the bell pepper into strips, and coin the carrots.
Toss the vegetables on the baking sheet with 1 tsp of olive oil, 0.125 tsp of sea salt, and 0.125 tsp of black pepper.
Roast the vegetables for 20 minutes until they are tender and the edges are slightly browned.
While vegetables roast, season the pork tenderloin with the remaining sea salt and black pepper.
Heat a cast-iron skillet over medium-high heat and sear the pork for 2-3 minutes per side until a dark smoky char develops.
Place the skillet in the oven (or transfer pork to the baking sheet) for 10-12 minutes until the internal temperature reaches 145°F.
Prepare the chimichurri by finely mincing the parsley, cilantro, and garlic clove.
In a small bowl, whisk the minced herbs and garlic with 1 tbsp olive oil, red wine vinegar, dried oregano, and red pepper flakes.
Let the pork rest for 5 minutes before slicing it into medallions and serving with a generous drizzle of chimichurri and the roasted vegetables.