Jansson's Temptation with Salmon uses cold smoked salmon, which is readily available.  Classic Jansson's frestelse or Jansson's Temptation consists of potatoes, yellow onion, Swedish ansjovies, heavy cream, salt & pepper. For some, finding the Swedish ansjovies called for in this dish is impossible, so we're using smoked salmon.  A simple and very nice Swedish comfort-food casserole.