Preheat your oven to 400°F (200°C) and line a rimmed baking sheet with parchment paper for easy cleanup.
In a small mixing bowl, whisk together the honey, tamari, Dijon mustard, and lemon juice until the glaze is smooth and well combined.
Trim the woody ends off the asparagus spears and place them on one side of the prepared baking sheet.
Place the salmon fillet on the other side of the baking sheet.
Drizzle the olive oil over the asparagus and season both the salmon and the asparagus with garlic powder, sea salt, and black pepper.
Brush the honey-tamari glaze generously over the top and sides of the salmon fillet.
Roast in the oven for 12 to 15 minutes, or until the salmon is opaque and flakes easily with a fork and the asparagus is tender and lightly browned.
Remove from the oven and serve immediately, spooning any extra glaze from the pan over the salmon.