Preheat your oven to 400°F (200°C) and line a large baking sheet 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.
Drizzle the asparagus with 0.25 tbsp of olive oil and sprinkle with half of the sea salt and black pepper, tossing to coat evenly.
In a small bowl, finely chop the fresh parsley and dill, then mix them with the garlic powder to create the aromatic herb crust.
Pat the salmon fillet dry with a paper towel, rub the top with the remaining 0.25 tbsp of olive oil, and press the herb mixture firmly onto the flesh.
Nestle the salmon fillet onto the baking sheet next to the asparagus.
Roast for 12 to 15 minutes, or until the salmon is opaque and flakes easily with a fork and the asparagus is tender.
Squeeze the fresh lemon juice over the salmon and roasted asparagus immediately before serving for a bright, zesty finish.