Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Snap the woody ends off the asparagus spears and arrange them in a single layer 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 baking sheet.
In a small ramekin, whisk together the olive oil, minced garlic, sea salt, black pepper, chopped dill, and chopped parsley.
Drizzle the herb oil mixture over both the salmon and the asparagus, using a brush or your hands to ensure everything is evenly coated.
Roast in the center of the oven for 12 to 15 minutes, or until the salmon flakes easily with a fork and the asparagus is tender-crisp.
Remove from the oven and immediately squeeze the fresh lemon juice over the salmon and vegetables to brighten the flavors before serving.