Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Toss the cubed red potatoes with avocado oil, half of the sea salt, and half of the black pepper until evenly coated.
Spread the potatoes in a single layer on the baking sheet and roast for 20-25 minutes until the edges are golden and crispy.
Pat the sirloin steak dry with a paper towel and season both sides with the remaining sea salt and black pepper.
Heat a cast-iron skillet over medium-high heat until very hot, then sear the steak for 3-4 minutes per side for a perfect medium-rare.
Reduce the heat to medium and add the ghee, minced garlic, rosemary, and thyme to the skillet.
Tilt the pan and use a spoon to continuously baste the steak with the fragrant melted herb butter for the final 2 minutes of cooking.
Remove the steak from the pan and let it rest on a cutting board for at least 5 minutes to lock in the juices.
While the steak rests, add the asparagus to the same skillet and sauté in the remaining garlic-herb drippings for 3-4 minutes until bright green and tender-crisp.
Slice the steak against the grain and serve alongside the roasted potatoes and charred asparagus.