Combine soy sauce, garlic, lemon juice, and sugar. Add salmon and marinate for 30 minutes.
Remove salmon and pat dry. Press 2 tsp black pepper onto the skin side of each piece of salmon coating thoroughly. In heavy skillet heat olive oil over medium high heat. Saute salmon 3 minutes each side til it flakes. Serve with cucumber vinaigrette. Puree cucumber, vinegar and sesame oil til emulsified. Season with salt and pepper.