
It's in debate as to whether or not that Potato and Leek Soup/Vichyssoise is of American or French origin. Many sources credit Louis Diat of the Ritz-Carlton in NYC as having invented it in 1917 for a roof-top garden restaurant, and it would have been served cold. Vichyssoise is named after the town of Vichy, which is near where Diat grew up. I guess you could say that both schools of thought are right since it was a French chef who invented it in NYC. If it's served hot, it's called Potato and Leek Soup and if it's served cold it's called Vichyssoise.