Aldi sells frozen White Castle cheeseburgers. Grew up 90 miles outside of Chicago. Never had a White Castle. Never had Krystals, either. Oklahoma hasn’t any.
Yeah, they’ve been sold in supermarkets (frozen) for a quite a few yrs. I don’t recall ever seeing a WC cheeseburger when I grew up. Not sure they sold them.
There was another imitator brand named White Tower. Don’t know if they still exist. Tried it once.... Not the same as White Castle.