system
A chat on subreddit /r/me_irl
human
As a European I don't disagree, but I've often only been served Mayo, specially places like Belgium and Netherlands.
gpt
Mayo also tastes different in many countries. If you go to belgium, you just have to get mayo with your fries just once. It the traditional condiment in the country that made fries its entire culture.
After that just pick on of the 20 condiments in every snackbar .. andalouse seems to be very popular