[Renaud]

> Onions, carrots, and celery

This is also a major base of French cuisine and called Mirepoix.

https://en.wikipedia.org/wiki/Mirepoix?wprov=sfti1

[huhkerrf]

In Cajun food, bell peppers replace carrots: https://en.wikipedia.org/wiki/Holy_trinity_(cooking)

[Renaud]

Fascinating to see that Mirepoix is such and old base that it was imported into the new continent and adapted with what was available locally!