HI,
Nashville Hot Chicken was once something you ate in Nashville.
Fried raviolis in St. Louis only and then a select few restaurants of Italian pedigree.
Pizza as we like it, stuffed, thin-crust et al, is not what the Italians envisioned. However, we made it our own.
Chinese food made by immigrants who cannot find the ingredients from home, they had to make do. No rice wine in the Caribbean, you use rum. No water chestnuts in North America, they use celery. New traditions are struck!
I once read a recipe for paella where Mountain Dew was used to substitute for saffron.
Trying to contain a culinary tradition strictly is highly ambitious and impossible to do.
Regards,