There probably isn't a more American condiment than ketchup. Millions of Americans douse their french fries, hamburgers, hot dogs and other favorite foods with it every day. The ubiquitous tomato-based sauce has been a staple in American cuisine for over a century, with surveys finding that 97% of kitchens in the United States contain a bottle. Given those facts, many Americans may be surprised to learn that ketchup's origins aren't American at all and that tomatoes were introduced to the mix relatively late in the sauce's history.