Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Pat the cod fillets very dry with paper towels to ensure the best texture after roasting.
Trim the tough, woody ends off the asparagus spears and arrange them on one side of the prepared baking sheet.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, and dried oregano.
Place the cod fillets on the other side of the baking sheet and drizzle the lemon-herb mixture evenly over both the fish and the asparagus.
Season everything with the sea salt and black pepper.
Bake for 12 to 15 minutes, or until the cod is opaque and flakes easily with a fork and the asparagus is tender-crisp.
Fluff the pre-cooked quinoa and place it in a serving bowl or plate.
Top the quinoa with the roasted cod and asparagus, then garnish with freshly chopped parsley before serving.