Which of the following is NOT true, according to the passage you have just heard

It would be hard to find a person in America who has never eaten a hamburger, but this popular food was not originally made in America. The original hamburger can be traced back to the middle Ages, when Russians ate raw meat that was scraped and shredded with a dull knife and formed into patties. It was called Tartar steak. This was the first step in a long series of developments that eventually resulted in hamburger, as we know it today.
    German sailors picked up the raw meat delicacy in their contacts with Russians and brought it back to their homeport of Hamburger. But the people there were not accustomed to eating raw meat, so they broiled the outside of the Russian steak; and so the American in the nineteenth, even today.
    German immigrants brought the Hamburger steak to America in the nineteenth century. Louis Lassen, a cook in New Haven, Connecticut, modified the Hamburger steak by sandwiching it between two pieces of bread. But the true American hamburger came into existence in St. Louis, at the Louisiana Purchase Exposition in 1904.
   At first this new food creation was made from scraps of poorer cuts of meat that were not used for anything else, but before long scraps were not enough. The demand for greater quantifies of hamburger could only be met by using the whole cow. Hamburger stands sprang up all over the country, and a side industry of condiments, such as ketchup and relish, grew up and prospered along with the popular hamburger.