Salad dressing, mayonnaise and mustard have to be refrigerated after you open the bottle. But what about ketchup?
I mean, most restaurants don't refrigerate the bottles every night, right? It sits at room temperature all day and seems to be fine. So, at home, do you store yours in a pantry? Or do you refrigerate it?
Apparently this is heavily debated topic!
And now there's a definitive answer: YES, ketchup needs to be refrigerated. Always.
"Ketchup no longer contains sodium benzoate and has less salt in it than it used to," says Susan Westmoreland, the Good Housekeeping Institute's Food Director. "Reducing these preservatives makes cold storage a must." [Source]
Here's a small part of the debate raging over on Twitter regarding this very subject: