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McDonald USA continued its successful Our Food/Your Questions campaign this week with a video that reveals what, exactly, goes into a McFry — and it’s not just, as host Grant Imahara hopes in the video’s early moments, “a potato that came straight out of the ground.”

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In the clip, Imahara “reverse engineers” the McDonald’s french fry, revealing that, yes, they do contain real potatoes — Russet Burbanks and Umatilla Russets, in the U.S., at least — but also a whole bunch of other stuff. In a second video about the fries (there are several), Imahara reveals that they contain salt and oil (canola and hydrogenated soy) but also sodium acid pyrophosphate, dimethylpolysiloxane, hydrolyzed wheat, hydrolyzed milk, citric acid, dextrose, natural beef flavour and tert-Butylhydroquinone. The fries contain 19 ingredients in total.

“That’s why McDonald’s french fry tastes like a french fry every time you eat it,” Imahara explains.