Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Trim the woody 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 perfect sear and place it on the other side of the pan.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, dried oregano, sea salt, and black pepper.
Drizzle the herb oil mixture over both the salmon and the asparagus, using a brush or your hands to coat everything evenly.
Slice half of the lemon into thin rounds and lay them across the top of the salmon fillet for infused flavor.
Bake for 12 to 15 minutes, or until the salmon flakes easily with a fork and the asparagus is tender yet crisp.
Remove from the oven, squeeze the remaining lemon juice over the dish, and garnish with freshly chopped parsley before serving.