Yes, a Steak Canadian is a real thing. No, it wasn't invented 'in a place called Ontario'
CBC
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https://i.cbc.ca/ais/1c87ff5f-7f82-48c3-a9ca-542e45e2b03c,1777055927092/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C335%2C720%2C405%29%3BResize%3D%28620%29" title="A Steak Canadian sandwich, despite the name, was invented in the U.K." width="620" />
Despite its name, the sandwich, which recently went viral on YouTube, is a purely British phenomenon.