The biggest difference between Hungarian goulash and American goulash is the type of meat used.  In Hungary, beef is typically used, while in America, ground beef or hamburger is often used.  Hungarian goulash also includes vegetables like peppers and onions, which are not common ingredients in American-style goulash.  Additionally, Hungarian goulash is more heavily spiced with paprika, caraway seeds, and marjoram than its American counterpart.  Lastly, Hungarian goulash typically serves as a soup, while American-style goulash tends to be thicker and serves more like a stew.  It's important to note that there are numerous regional variations within each country, so these differences can vary depending on where you go. Regardless, both types of goulash can be delicious and provide a hearty meal!