"Sil" is the word in Swedish for herring. It is traditionally served in the manner depicted in this photo, either smoked or pickled. I was unable to find herring, so I substituted smoked salmon (another Swedish favorite, as well as mine). I used boiled potatoes, smoked Alaskan salmon, and whole-grain flatbread. The yellowish sauce is a dijon mustard sauce with dill, and the white sauce is a creamy horseradish sauce.