Fry the brown peppercorn over low heat in dry frying pan for 1 minute. When it is brown and smells good, add salt and fry 1 more minute. Place in a bowl and let cool. Mix with green onion, ginger and wine.
Clean and wipe the duck. Rub the outside and inside of duck with fried peppercorn and salt (#1). Let stand for 6 hours or overnight.