How Does Ketchup Work?

This all-American condiment got its start as a fermented fish sauce and featured in the formation of the Food and Drug Administration. Learn about the history of tomato ketchup -- and why it's so hard to get out of bottles -- in today's episode of BrainStuff, based on this article: https://recipes.howstuffworks.com/ketchup.htm See omnystudio.com/listener for privacy information.