Pat cod fillets completely dry using paper towels and season surfaces with black pepper.
In a small whisking bowl, combine soy sauce, honey, grated ginger, minced garlic, rice vinegar, and sesame oil until emulsified.
Heat oil in a non-stick skillet over medium-high heat until shimmering.
Place cod fillets in the skillet and sear undisturbed for 4 minutes until a golden crust forms and the fish releases easily from the pan.
Carefully flip the fillets using a fish spatula.
Reduce heat to medium and pour the prepared glaze mixture into the skillet.
Simmer the sauce for 3 to 4 minutes, continuously spooning the liquid over the fillets (basting) until the sauce reduces to a syrupy consistency and the internal temperature of the cod reaches 145 degrees Fahrenheit.
Remove from heat and serve immediately, garnished with sliced green onions.