Preheat your oven to 400°F and line a baking sheet with parchment paper.
In a small bowl, mix 1 tsp of olive oil with the minced garlic, chopped rosemary, thyme, sea salt, and black pepper to create a paste.
Pat the flank steak dry with a paper towel and rub the herb paste thoroughly onto both sides of the meat.
Place the trimmed asparagus on the prepared baking sheet, drizzle with the remaining 1 tsp of olive oil, and toss to coat.
Heat a large cast-iron skillet over medium-high heat until very hot, then sear the steak for 3-4 minutes on each side to develop a deep brown crust.
Transfer the skillet to the oven and roast for 5-8 minutes until it reaches your desired level of doneness.
Remove the steak from the oven and let it rest on a cutting board for at least 5-10 minutes to lock in the juices.
Slice the steak thinly against the grain and serve with the roasted asparagus, finished with a bright squeeze of lemon juice.