Preheat your oven to 400°F (200°C) and line a small baking sheet with parchment paper.
Prepare the asparagus by snapping off the woody ends, then toss them on the baking sheet with 0.5 teaspoons of olive oil and half of the sea salt and black pepper.
Roast the asparagus in the oven for 10 to 12 minutes until they are bright green and tender-crisp.
While the vegetables roast, whisk together the honey, cajun seasoning, garlic powder, onion powder, and smoked paprika in a small bowl.
Pat the salmon fillet completely dry with a paper towel to ensure a proper sear.
Brush the honey-cajun glaze generously over the flesh side of the salmon fillet, then season with the remaining salt and pepper.
Heat the remaining 1 teaspoon of olive oil in a non-stick skillet over medium-high heat until shimmering.
Place the salmon in the pan, glazed-side down, and sear for 3 to 4 minutes until the honey caramelizes into a dark, flavorful crust.
Flip the fillet carefully and cook for an additional 3 to 5 minutes until the fish is opaque and flakes easily with a fork.
Serve the blackened salmon immediately alongside the roasted asparagus with a fresh squeeze of lemon juice.