Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Rinse the quinoa under cold water and place it in a small pot with 0.5 cups of water; bring to a boil, then reduce to a simmer, cover, and cook for 12-15 minutes until fluffy.
Trim the woody ends off the asparagus and place the spears on one side of the prepared baking sheet.
Pat the cod fillet dry with a paper towel and place it on the other side of the baking sheet.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, lemon juice, lemon zest, sea salt, and black pepper.
Drizzle the lemon-herb mixture evenly over the cod fillet and the asparagus, tossing the asparagus gently to ensure it is well coated.
Bake in the center of the oven for 12-15 minutes, or until the cod is opaque throughout and flakes easily with a fork.
Fluff the cooked quinoa and plate it alongside the roasted asparagus and cod.
Garnish the entire dish with freshly chopped parsley and an extra squeeze of lemon if desired.