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Not lettuce, but lutefisk is a traditional Norwegian dish made of whitefish and lye, the active ingredient in Drano. https://en.m.wikipedia.org/wiki/Lutefisk

> 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.

And also, just because it's traditional, doesn't mean it's good for you :)