Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Trim the woody ends off the asparagus and place the spears on the baking sheet.
Drizzle the asparagus with olive oil and season with half of the sea salt and black pepper, tossing to coat evenly.
Roast the asparagus in the oven for 12 to 15 minutes until tender and slightly charred at the tips.
While the vegetables roast, pat the sirloin steak dry with paper towels and season both sides with the remaining salt and pepper.
Heat a heavy cast-iron skillet over medium-high heat until very hot, then sear the steak for 3 to 4 minutes per side for medium-rare.
Reduce the heat to low and add the ghee, minced garlic, rosemary, and thyme to the skillet.
Carefully tilt the pan and use a spoon to baste the steak with the melting garlic-herb ghee for about 1 minute.
Transfer the steak to a cutting board and let it rest for at least 5 minutes to lock in the juices.
Slice the steak against the grain and serve alongside the roasted asparagus with a fresh squeeze of lemon juice over everything.