With 97% of U.S. households stocking this condiment in their refrigerators, it's clear that ketchup is a national favorite ... you'll also find Primal Kitchen Organic Unsweetened Ketchup, a ...

This story appears in the February 2019 issue of National Geographic magazine. Ketchup—that cheerful red sauce sold in handy glass bottles—first came on the American market in the 19th century.