Preheat your oven to 400°F and line a baking sheet with parchment paper for easy cleanup.
Pat the salmon fillet dry with a paper towel to ensure the crust adheres properly to the surface.
In a small bowl, combine the hemp hearts, garlic powder, sea salt, and black pepper until well mixed.
Brush the top of the salmon fillet evenly with the Dijon mustard to act as a binder for the crust.
Press the hemp seed mixture firmly onto the mustard-coated side of the salmon until it is well-covered.
Place the salmon on one side of the baking sheet and the trimmed asparagus spears on the other side.
Drizzle the asparagus with the extra virgin olive oil and a small pinch of salt, tossing them to coat.
Roast for 12 to 15 minutes, or until the salmon flakes easily with a fork and the hemp seeds are golden.
Drizzle the fresh lemon juice over both the salmon and the asparagus before serving immediately.