Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash the asparagus and snap off the tough, woody ends, then place the spears on one side of the prepared baking sheet.
Pat the cod fillet completely dry with a paper towel to ensure a better texture and place it on the other side of the baking sheet.
In a small glass bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, and minced garlic.
Drizzle the lemon-garlic mixture evenly over both the cod and the asparagus, then sprinkle both with sea salt and black pepper.
Bake in the center of the oven for 12 to 15 minutes, until the cod is opaque and flakes easily with a fork and the asparagus is tender with lightly browned tips.
While the fish bakes, warm your pre-cooked quinoa in a small pan or the microwave.
Transfer the fluffy quinoa to a plate, top with the roasted asparagus and the cod fillet, then garnish with a generous sprinkle of fresh chopped parsley.