Pat the cod fillets dry with a paper towel and season both sides with sea salt, black pepper, and dried oregano.
Heat half of the olive oil in a large non-stick skillet over medium-high heat.
Add the asparagus and cherry tomatoes to the skillet, sautéing for 4-5 minutes until the asparagus is tender-crisp and tomatoes begin to blister.
Remove the vegetables from the pan and set aside on a plate with the cooked quinoa.
Add the remaining olive oil to the same skillet and place the cod fillets in the pan.
Sear the cod for 3-4 minutes per side until the exterior is golden brown and the fish flakes easily with a fork.
In a small bowl, whisk together the lemon juice, lemon zest, and minced garlic.
During the last minute of cooking, pour the lemon mixture over the fish to glaze.
Serve the cod immediately over the quinoa and vegetables, drizzling any remaining pan juices over the top.