Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper for easy cleanup.
Trim the woody ends off the asparagus and mince the garlic clove.
Place the cod fillet on one side of the baking sheet and arrange the asparagus and cherry tomatoes on the other side.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, sea salt, and black pepper.
Drizzle the lemon-herb mixture evenly over the cod and the vegetables, tossing the vegetables slightly to coat.
Bake for 12-15 minutes, or until the cod is opaque and flakes easily with a fork and the asparagus is tender.
While the fish bakes, warm the pre-cooked quinoa in a small saucepan or microwave.
Remove the tray from the oven and garnish everything with freshly chopped parsley and dill.
Plate the cod and roasted vegetables over the bed of quinoa, drizzling any remaining juices from the pan over the top.