If I knew how to include diacritical marks in postings, I would have spelled "du" with a circumflex, since it's the past participle of "devoir". That would probably have been a great help in deciphering that sentence. Also, to all those who have been cogitating on "zwo Pfund Hackfleisch", "zwo" is indeed the low German or slang equivalent of "two" and the phrase means "two pounds of ground beef."