Preheat your oven to 400°F and line a baking sheet with parchment paper.
Trim the woody ends off the asparagus and place them on the baking sheet. Toss with half of the sea salt and black pepper, and a tiny drizzle of melted ghee if desired.
Roast the asparagus for 12-15 minutes until tender and slightly charred at the tips.
While the vegetables roast, pat the steak dry with paper towels and season both sides with the remaining salt and pepper.
Heat a cast-iron skillet over medium-high heat until very hot. Place the steak in the dry pan and sear for 3-4 minutes per side for medium-rare.
Reduce the heat to medium and add the ghee, smashed garlic cloves, and the rosemary sprig to the pan.
Tilt the pan slightly and use a spoon to continuously baste the steak with the melted garlic-herb ghee for 1-2 minutes.
Remove the steak from the pan and let it rest on a cutting board for 5 minutes before slicing against the grain.
Serve the sliced steak alongside the roasted asparagus, drizzling any remaining pan juices over the meat.