In the United States, the consensus is ketchup. Or chili. Or cheese. Or black pepper.
Well, maybe there isn't a total consensus on what to put on French fries. Even as close as Canada, there are other options you may not have thought about.
in the Chicago Tribune
spotlights using vinegar on fries, especially malt vinegar but not sometimes regular vinegar. In some parts such as Ontario, mayonnaise is used. Then again, poutine
is popular in Quebec.
Truthfully, lots of good things can go on fries and taste good.
But in moderation.