Our circle of friends circle in Germany is very multicultural with people from several countries.

InAt those cases it is veryese events, typical thatly national dishes are prepared.

In fact, this is THE national dish to me,for me and then I have found it all over Spain in a more homogeneous way than other candidat, made in a similar manner unlike most other Spanish dishes.

Not sure what you mean by homogeneous- made the same way, using the same recipe perhaps

For instance, I consider gazpacho and paella more typical in southern Spain, although nowadays it is not unusual to find them in the northern regions.

National dishes normally come from the working classes and the Spanish tortilla is no different.

The first written mentionreference goes back to the nineteenth century.

Our friends circle in Germany is very multicultural, with people from several countries.

"friend circle" is a fixed phrase, and even though it's made up of multiple friends you still say "friend circle"

In thoese cases it is very typical that national dishes are prepared.

"These" makes it clearer that you're still talking about the situation you just described

In fact, this is THE national dish to me, thensince I have found it all over Spain in a more homogeneous wayto be more widespread across Spain than other candidates.

"Homogeneous" isn't grammatically incorrect here, but I think "widespread" is closer to what you mean

National dishes normally come from working classes, and the Spanish tortilla is no different.