In a sealable plastic bag combine well the soy sauce, garlic, lemon juice, and sugar. Add the salmon, coating it well, and let it marinate, sealed and chilled, for 30 minutes.

Remove the salmon from the bag, discarding the marinade, pat it dry, and press 2 teaspoons of the pepper onto each piece of salmon, coating it thoroughly.

In a heavy skillet heat the oil over moderately high heat until it is hot but not smoking and saute the salmon for 2 minutes on each side, or until it just flakes. Transfer the salmon with a slotted spatula to paper towels and let it drain for 30 seconds.