The first record of the term rakfisk dates back to 1348, but the history of this food is probably even older. No sources are available as to the exactinvention year of the rakfiskdish or the autolysis process that produces the raw material for it.
Rakfisk is made from fresh trout or char. After gutting and rinsing, the fish is placed in a bucket and salted. Small amounts of sugar may be added to speed up the autolyzation process. The fish is then placed under pressure with a lid that fits down into the bucket and a weight on top. A brine is formed as the salt draws moisture from the fish. The rakfisk bucket is stored at under 5 degrees Celsius for one to three months.