Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Trim the woody, fibrous ends off the asparagus spears and place them on one side of the prepared baking sheet.
Pat the salmon fillet dry with a paper towel to ensure a better roast and place it on the other side of the sheet.
In a small glass bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, minced garlic, and dried oregano.
Drizzle the lemon-herb mixture evenly over both the salmon and the asparagus, using a brush or your hands to ensure the asparagus is well coated.
Sprinkle the sea salt and black pepper over the entire tray.
Bake for 12 to 15 minutes, depending on the thickness of the salmon, until the fish flakes easily with a fork and the asparagus is tender-crisp.
Remove from the oven and garnish with finely chopped fresh parsley before serving immediately.