This pickled herring sandwich is served on rye bread with red onions, capers and parsley. There are many variations of pickled herring and if you have an Ikea nearby, there is a big chance you might be able to find an jar of pickled herring there. Most open faced sandwich feasts in Denmark starts with fish, usually herring such as this. They are usually served with the local schnapps (Snaps), cooled in the freezer, which you are expected to drink in one fell swoop as a shot. The schnapps really brings out the flavor of the herring, and should not be missed.