Preheat your oven to 400°F and line a small baking sheet with parchment paper.
Halve the baby potatoes and toss them with the avocado oil and a pinch of sea salt on the prepared sheet.
Roast the potatoes for 20 to 25 minutes, tossing halfway through, until they are golden and crispy.
Pat the sirloin steak completely 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 very hot, then place the steak in the pan.
Sear the steak for 3 to 4 minutes per side to develop a deep brown crust for medium-rare doneness.
Lower the heat to medium and add the ghee, smashed garlic cloves, rosemary, and thyme to the skillet.
Tilt the pan slightly and use a spoon to continuously pour the melting herb ghee over the steak for 2 minutes.
Transfer the steak to a board to rest for 5 minutes, then quickly sauté the asparagus in the remaining pan fat until bright green and tender.
Slice the steak against the grain and serve immediately with the roasted potatoes and asparagus.