Combine soy sauce and sugar. Brush each salmon steak with soy sauce mixture. Barbecue on solid plate, turning occasionally until salmon is cooked. Serve hot with Green Sauce. GREEN SAUCE: Place parsley, chives,capers and onion in the bowl of a food processor or blender. Process until finely chopped. Add olive oil, lemon or lime juice and egg. Process until smooth. Season with freshly ground black pepper. Serves 4.