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The real question is how old were you when you realized there was no N in restaurateur. My decades were at least several.
Apparently “restauranteur” is common enough to have an entry in the Collins’ so consider your honor restored
https://www.collinsdictionary.com/dictionary/english/restauranteur
Apparently I was today years old.
Although (in my limited defence) I am not sure I have ever actually used to that word or written that word down.