Preheat your oven to 400°F (200°C).
Trim the woody ends off the asparagus and place the spears on a parchment-lined baking sheet.
Drizzle the asparagus with half of the avocado oil and season with a pinch of sea salt and black pepper.
Roast the asparagus in the oven for 12-15 minutes until tender and slightly charred.
While the asparagus roasts, heat the remaining avocado oil in a large cast-iron skillet over medium-high heat.
Add the ground sirloin to the skillet, breaking it into small crumbles with a wooden spoon.
Season the beef with garlic powder, onion powder, and the remaining sea salt and black pepper.
Spread the beef in an even layer and let it sear undisturbed for 3-4 minutes to develop a golden-brown, crispy crust.
Stir the beef and continue cooking for another 2-3 minutes until fully browned and crispy throughout.
Plate the crispy sirloin alongside the roasted asparagus and finish with a fresh squeeze of lemon juice.