For Lutefisk, you'll probably have to
make your own from salt or (preferably) dried cod, though personally I find it a waste of good dried or salt cod!
"The first treatment is to soak the stockfish in cold water for five to six days (with the water changed daily). The saturated stockfish is then soaked in an unchanged solution of cold water and lye for an additional two days. The fish swells during this soaking, and its
protein content decreases by more than 50 percent producing a
jelly-like consistency. When this treatment is finished, the fish (saturated with lye) has a
pH value of 11–12 and is therefore
caustic. To make the fish edible, a final treatment of yet another four to six days of soaking in cold water (also changed daily) is needed. Eventually, the lutefisk is ready to be cooked. "
Yummm!
Tom