We got in touch with McDonald's in the UK after reading this story claiming that the UK recipe is different to the one detailed below.
A spokesman said:
"The only ingredients in our UK Fries are potatoes, vegetable oil (a blend of sunflower and rapeseed) and dextrose (predominantly added at the beginning of the potato season) with nothing added except a sprinkling of salt after cooking. Customers can request that their Fries are served without salt."
In this video, Grant Imahara "reverse engineers" McDonald's fries.
And in this video, he talks us through the ingredients.
Here's the end of the process: the potatoes being frozen.
Before that, they're partially fried.
And before that, you have the ingredient dip, whereby the fries are made golden.
Right. Making chips. These potatoes...
...are about to be fired through here...
And the film ends in heartwarming fashion as our hero digs up an actual potato, which is what McDonald's wants you to know is what they use.
Alan White is a news editor for BuzzFeed News and is based in London.
Contact Alan White at email@example.com.
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