Preheat your oven to 400°F and line a baking sheet with parchment paper.
Halve the baby gold potatoes and trim the woody ends off the asparagus spears.
Toss the potatoes and asparagus with the extra virgin olive oil and a pinch of the sea salt and black pepper.
Spread the vegetables on the baking sheet and roast for 20 minutes, or until the potatoes are golden and the asparagus is tender.
While the vegetables roast, pat the sirloin steak dry with a paper towel and season both sides with the remaining sea salt, black pepper, and dried rosemary.
Heat a heavy cast-iron skillet over medium-high heat until very hot.
Place the steak in the dry skillet and sear for 3 to 4 minutes per side for a medium-rare finish.
During the last minute of searing, add the ghee and minced garlic to the pan; tilt the pan and spoon the foaming garlic ghee over the steak repeatedly.
Remove the steak from the skillet and let it rest on a cutting board for 5 minutes to lock in the juices before slicing.
Serve the sliced steak topped with any remaining garlic ghee from the pan alongside the roasted potatoes and asparagus.