Preheat your oven to 400°F and line a baking sheet with parchment paper.
Cut the sweet potato into thin wedges and toss them on the baking sheet with the asparagus, olive oil, and a pinch of salt and pepper.
Roast the vegetables for 20 minutes until the sweet potatoes are tender and the asparagus is lightly browned.
While the vegetables roast, pat the sirloin steak 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 it is very hot and slightly smoking.
Place the steak in the skillet and sear for 3 to 4 minutes per side for a medium-rare finish.
In a small bowl, mash the ghee together with the minced garlic, chopped rosemary, and chopped thyme.
Remove the steak from the skillet and transfer to a cutting board to rest for 5 minutes.
Top the warm steak with the garlic herb ghee and serve immediately alongside the roasted vegetables.