Pat the sirloin steak completely dry with paper towels and season both sides generously with sea salt and black pepper.
Heat a cast-iron skillet over medium-high heat until very hot, then add half of the ghee to coat the bottom.
Place the steak in the skillet and sear for 3-4 minutes per side for medium-rare, or until a golden-brown crust forms.
During the last 2 minutes of cooking, add the remaining ghee, smashed garlic cloves, rosemary, and thyme to the pan.
Tilt the pan slightly and use a spoon to continuously baste the steak with the melted herb-infused ghee.
Remove the steak from the pan and let it rest on a cutting board for at least 5 minutes to lock in the juices.
While the steak rests, toss the asparagus into the same skillet and sauté for 3-5 minutes until bright green and slightly charred.
Slice the steak against the grain and serve immediately with the asparagus and a drizzle of the pan juices.