The document discusses the origins of the hamburger. It describes how the Mongol warriors would carry flat patties of raw meat under their saddles as they rode into battle. The meat would soften and tenderize from being pressed against the saddles and horses' backs. This allowed the warriors to easily eat meat with one hand while continuing to ride for long periods with no opportunity to stop and cook. Although hamburgers have evolved since, this is seen as the earliest origin of the raw ground meat patties that would later be refined and popularized as hamburgers.