Preheat your oven to 425°F and line a small baking sheet with parchment paper.
In a small bowl, combine the minced garlic, chopped rosemary, chopped thyme, sea salt, black pepper, and half of the olive oil to create a thick herb paste.
Pat the beef tenderloin dry with a paper towel and rub the herb paste evenly over all sides of the meat.
Place the beef on one side of the prepared baking sheet and roast for 10 minutes.
While the beef is roasting, toss the asparagus spears in a bowl with the remaining olive oil and a pinch of salt.
Add the asparagus to the other side of the baking sheet and continue roasting for another 8 to 12 minutes, or until the beef reaches an internal temperature of 135°F for medium-rare.
Remove the sheet pan from the oven and transfer the beef to a cutting board to rest for at least 5 minutes before slicing.
Drizzle the fresh lemon juice over the roasted asparagus and serve immediately alongside the sliced beef.