Pat the cod fillets completely dry with paper towels and season both sides evenly with sea salt and black pepper.
Prepare the quinoa according to package instructions so it is warm and fluffy for serving.
Steam or lightly sauté the asparagus in a separate pan with a splash of water until it is crisp-tender and vibrant green.
Heat the avocado oil in a large stainless steel or cast iron skillet over medium-high heat until the oil is shimmering.
Carefully place the cod in the hot skillet and sear for 3 to 4 minutes without moving it, until a golden-brown crust forms.
Gently flip the fish and cook for an additional 2 to 3 minutes until the flesh is opaque and flakes easily with a fork.
Remove the fish from the pan and set aside; reduce the heat to medium and add the ghee, minced garlic, and lemon zest to the skillet.
Stir the aromatics for 30 seconds until fragrant, then whisk in the lemon juice and chopped fresh parsley to finish the sauce.
Plate the cod over the warm quinoa with the asparagus on the side, then spoon the zesty lemon sauce generously over the fish.