Citrus Cured Gravlax with Horseradish Creme Fraiche

Home made gravlax is ridiculously easy to make, yet so impressive to serve as a celebratory starter or as part of a buffet.  During the Middle Ages, Scandinavian fishermen made gravlax by salting the freshly caught salmon and burying it in the sand above the high-tide line to lightly ferment it.  The...