Preheat oven to 400 degrees F.
Slice the sweet potato into 1/2-inch thick wedges and toss with olive oil, sea salt, and black pepper on a parchment-lined baking sheet.
Roast the sweet potato wedges for 20 to 25 minutes until the edges are golden and crispy.
Pat the sirloin steak dry with paper towels and season both sides generously with 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 3 to 4 minutes per side for medium-rare, or until your desired doneness is reached.
Reduce the heat to medium and add the ghee, smashed garlic clove, and fresh rosemary sprig to the pan.
Tilt the pan and use a spoon to continuously baste the steak with the melted garlic-herb ghee for 1 minute.
Transfer the steak to a cutting board and let it rest for at least 5 minutes before slicing against the grain.
While the steak rests, add the asparagus to the same skillet and sauté for 3 to 5 minutes until tender and slightly charred.