Insider visited the Heinz Tomato Ketchup factory in Elst, Netherlands, where 1.8 million is made It's one of the world's most popular condiments, and it can be found in many households around the ...

To create its preservative-free ketchup, the company switched to a thicker, tomato-rich version—the foundation for the condiments of today. The preservative sodium benzoate, which Heinz removed ...