It doesn't work with the joke though: Americans use the word "pudding" to refer to something sweet while Brits use the word "biscuit" to refer to something sweet. Fries aren't sweet in either of the two opposing dialects. So both should be able to see the appeal
I wasn't being sarcastic. I like both poutine and biscuits and gravy, and I'm pretty sure gravy on pudding is good too. They all sound off-putting if you don't know what they are, though.