What does Genghis Khan have to do with a hamburger?

Mongolianartist.com and Mongolia Web quote Ask Yahoo! on the hamburger:

The fast food favorite took a long, slow trip from Genghis Khan through Russia and Germany before arriving at McDonald's.
...
In the 1200s, Genghis Khan's Mongol armies ate patties of raw lamb scraps, which were tenderized under the soldiers' saddles.

Doubtful if this is historically correct, but a good story nevertheless.
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technorati: mongolia hamburger genghis khan