Preheat your oven to 400°F (200°C).
In a small bowl, whisk together the finely ground coffee, garlic powder, smoked paprika, sea salt, and black pepper.
Pat the beef tenderloin completely dry with paper towels, then press the coffee rub firmly into all sides of the meat until well-coated.
Place the asparagus spears on a small baking sheet, lightly coat with a tiny fraction of the ghee, and set aside.
Heat the remaining ghee in a cast-iron or oven-safe skillet over medium-high heat until it begins to shimmer.
Sear the steak for 2-3 minutes per side to develop a dark, aromatic crust.
Transfer the skillet to the oven along with the tray of asparagus.
Roast for 6-8 minutes, or until the steak reaches your desired level of doneness and the asparagus is tender.
Remove the steak from the oven and let it rest on a cutting board for 5 minutes to allow the juices to redistribute.
Drizzle the lemon juice over the roasted asparagus and serve alongside the sliced coffee-crusted steak.