There is almost certainly a bottle of ketchup in your refrigerator right now. It has a red label, it's made of tomatoes, and it's probably Heinz. You've never questioned any of this. But the tomato version of ketchup is a relatively recent invention — and for most of ketchup's history, tomatoes had nothing to do with it whatsoever.
The word "ketchup" traces back to a Chinese fermented fish sauce called kê-tsiap — a salty, intensely savory liquid used across Southeast Asia for centuries. British sailors encountered it during trading voyages in the 1600s and brought the concept back to Europe, where cooks promptly began making their own versions using whatever umami-rich ingredients they had on hand. What they reached for wasn't tomatoes. It was mushrooms.
For over a century, ketchup in Britain and America meant mushroom ketchup — a dark, thick, intensely savory sauce made by packing mushrooms with salt, letting them break down, then cooking and bottling the liquid. Recipes for mushroom ketchup appeared in American cookbooks as early as 1770. Walnut ketchup was also popular. Oyster ketchup existed. The word "ketchup" simply meant a savory, vinegary condiment — and the tomato version was just one obscure variety among many.
Tomatoes had a reputation problem. For most of the 18th and early 19th centuries, Europeans and Americans treated them with deep suspicion — they were cousins of deadly nightshade, often called "poison apples," and most people wouldn't touch them. The first known tomato ketchup recipe didn't appear until 1812, and even then, the early versions were unstable, watery, and prone to spoiling within days. Nobody was particularly excited about them.
Enter Henry Heinz. In 1876, the Pittsburgh condiment entrepreneur began selling bottled tomato ketchup — but he wasn't the first to do so. What made Heinz different was chemistry and marketing. He figured out that using fully ripe tomatoes with higher levels of natural pectin, combined with generous amounts of vinegar and sugar, created a product stable enough to sit on a shelf for months without preservatives. He also made it sweet, which American palates loved. The formula worked.
Then came the marketing machine. Heinz's "57 Varieties" campaign — introduced in 1896, even though the company was already selling over 60 products — plastered ketchup onto every shelf and table in America. By 1900, Heinz's tomato ketchup was so dominant that the centuries-long reign of mushroom ketchup effectively ended almost overnight. History quietly forgot that "ketchup" had ever meant anything else.
Mushroom ketchup never fully disappeared — a British brand called Geo. Watkins still makes and sells it today, and it's a staple ingredient in traditional British cooking. But in America, one man's shelf-stable tomato formula became so synonymous with the word "ketchup" that generations of people grew up not knowing there had ever been anything else.
The condiment didn't change because tomatoes were better. It changed because one company figured out how to make tomatoes last — and then convinced everyone that's how it had always been. Next time you squeeze that red bottle, know that somewhere, a 250-year-old mushroom recipe is quietly judging you.
