Make the marinade by combining all the ingredients in a food processor or blender until well blended.
Season the rock cod generously with salt and pepper on both sides. Pour most of the marinade over the fish, reserve a couple of tablespoons to drizzle over the cooked fish. Marinate from 30 to 1 hour.
In a large skillet add the olive oil and sauté the fish for 3 minutes per side until golden.
Drizzle remaining marinade over the fish and garnish with parsley (optional)
Do not over-marinate the fish. The soy sauce and rice vinegar are flavorful enough that 30 minutes to 1 hour is plenty. Any longer and the texture of the cod can begin to change.Pat the fish dry before cooking. This helps the cod sear beautifully instead of steaming in the skillet.Use fresh ginger and garlic. They make all the difference here and give the marinade that bright, lively flavor I love.Keep the skillet hot. A properly heated pan gives the fish a lovely golden exterior while keeping the inside tender and moist.Turn the fish only once. Cod is delicate, so let it develop a good crust before gently flipping it.Watch the cooking time carefully. Fish cooks quickly, and overcooking will make it dry. Remove it from the heat as soon as it flakes easily with a fork.Reserve some marinade before adding the fish. That way, you have a clean, flavorful sauce to spoon over the cod just before serving.
Giangi's Kitchen provides nutritional information, but these figures should be considered estimates, as a registered dietician does not calculate them.