Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and dice the sweet potato into 1-inch cubes, then toss with olive oil and a pinch of sea salt and black pepper.
Spread the sweet potatoes on the baking sheet and roast for 20-25 minutes until the edges are golden and caramelized.
Pat the steak dry with a paper towel and season both sides generously with the remaining sea salt and black pepper.
Heat a heavy cast-iron skillet over medium-high heat until it is smoking slightly.
Place the steak in the hot skillet and sear for 4 to 5 minutes per side for medium-rare.
During the last 2 minutes of cooking, add the ghee, smashed garlic cloves, and fresh rosemary to the pan.
Tilt the pan 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 for at least 5 minutes on a cutting board.
While the steak rests, toss the asparagus spears into the same skillet and sauté for 3-4 minutes until bright green and tender-crisp.
Slice the steak against the grain and serve with the roasted sweet potatoes and sautéed asparagus.