Pat the black cod dry and season lightly with salt
Marinate if desired, such as with miso, soy, mirin, and sugar
Preheat the oven to 400°F
Heat an oven-safe skillet over medium-high heat
Add a little oil to the skillet
Sear the black cod skin-side down for 2 to 3 minutes
Flip the fish carefully
Transfer the skillet to the oven
Bake for 6 to 10 minutes, until the fish flakes easily
Alternatively, broil for 4 to 6 minutes after searing
Remove from the oven and rest for 2 minutes
Serve with rice, vegetables, or a simple sauce