According to Official Guinness Records,
The largest schnitzel weighed 550 kg (1212.54 lbs) and was prepared by Martin Liebscher (Germany) in Rosbach von der Höhe, Germany, 19 May 2011.
The schnitzel ripped into smaller peices and was originally 890 kg (1962.11 lbs) heavy. The record weight, 550 kg (1212.54 lbs) is the weight of the lartest single part.
For a complete list of 2011 records, please visit 2011 Guinness Records in Germany.