Bring a pot of water to a boil and cook the soba noodles according to the package instructions until al dente, then drain and set aside.
Pat the cod fillets thoroughly dry with paper towels and season both sides evenly with sea salt and black pepper.
Heat the ghee in a large non-stick skillet over medium-high heat until it begins to shimmer.
Place the cod fillets in the skillet and sear for 3 to 4 minutes per side until the exterior is golden and the fish flakes easily with a fork.
Remove the cod from the skillet and set aside on a plate; in the same skillet, add the sesame oil, minced garlic, and grated ginger.
Sauté the aromatics for 30 seconds until fragrant, then add the sliced baby bok choy and cook for 2 minutes until the leaves are wilted.
Add the cooked soba noodles and tamari to the skillet, tossing everything together for 1 minute to ensure the noodles are well-coated and hot.
Divide the garlic noodles and bok choy between plates, top with the seared cod fillets, and garnish with sesame seeds before serving.