Besides fast food, isn't it always like that though? Of course Japanese food is cheaper in Japan, but I bet Spanish food is more expensive there than in Spain? Or Peruvian food being a lot more expensive in Europe compared to in Peru itself, it kind of makes sense.

yes, that is the case.

But I think the point is that paying 7€ makes it a pretty good deal, at 14€ for "a bowl of soup" it becomes a meh experience.

Similarly, as an Italian abroad, I can get a decent pizza margherita in Budapest, but it costs 12 euros and I get upset every time, you shouldn't spend that much for a bit of dough and mozzarella :)