Actually Burger King stole it from Primanti Brothers.   This is from the article you linked: Never mind that Pittsburgh's been putting fries between bread for decades now, this is the future of fast food: Take some things you already have in house, gussy them up a little into a sandwich, then sit back and watch the Internet sizzle over the news. [Grub Street] And this is from an AI  search: The idea of putting fries on a sandwich is attributed to Joe Primanti, who, during the Great Depression, began serving sandwiches to truck drivers in Pittsburgh. The concept reportedly originated when a trucker brought a load of potatoes, leading to the addition of fried potatoes to the sandwiches, creating the now-famous Primanti sandwich   Amen.  Or pulled and placed on the side if served on the sandwich.

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