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So when, how and why did sauerkraut become part of bigos? For example, to Henryk Sienkiewicz, a turn-of-the-20th-century writer and Nobel-Prize winner, sauerkraut in bigos was so obvious that he assumed it must have been just as obvious to Lord John Humphrey Zagłoba, a character from his trilogy of historical novelsset in 17th-century Poland.