Rinse the quinoa under cold water, then combine with 0.5 cup water in a small pot; bring to a boil, reduce heat, cover, and simmer for 15 minutes.
Pat the cod fillets completely dry with paper towels to ensure a proper sear, then season both sides with sea salt, black pepper, and garlic powder.
Heat the ghee in a large non-stick skillet over medium-high heat until shimmering.
Place the cod in the skillet and sear for 3 to 4 minutes per side until the exterior is golden brown and the fish flakes easily with a fork.
While the fish cooks, steam the asparagus spears for 4 to 5 minutes until they are bright green and tender.
In a small bowl, whisk together the Greek yogurt, chopped fresh dill, lemon juice, and lemon zest to create the sauce.
Fluff the cooked quinoa with a fork and plate it alongside the steamed asparagus.
Top the quinoa with the pan-seared cod and drizzle the lemon-dill sauce generously over the fish before serving.