Pat the cod fillets completely dry with paper towels and season both sides evenly with sea salt and black pepper.
Heat the ghee in a large cast-iron skillet over medium-high heat until it is shimmering and hot.
Carefully place the cod fillets in the skillet and sear for 3 to 4 minutes without moving them until a golden-brown crust forms.
Gently flip the fillets and cook for another 2 to 3 minutes until the fish is opaque and flakes easily with a fork.
While the fish is finishing, steam the asparagus spears for about 4 minutes until they are bright green and crisp-tender.
Remove the cod from the pan and set aside; lower the skillet heat to medium and add the minced garlic, sautéing for 30 seconds.
Whisk in the lemon juice, lemon zest, and chopped fresh dill into the pan drippings to create a light, aromatic sauce.
Place the cooked quinoa and steamed asparagus on a plate, top with the cod fillets, and drizzle the velvety lemon-dill sauce over the top.