Mirepoix (cuisine)
Similar flavour bases include the Italian "soffritto", the Spanish "sofrito", "refogado/sufrito" (braised onions, garlic and tomato) from Portuguese-speaking nations, the German "suppengrün" (leeks, carrots and celeriac), the Polish "włoszczyzna" (leeks, carrots, celery root and parsley root), the US Cajun / Creole holy trinity (onions, celery and bell peppers), and possibly the French "duxelles" (mushrooms and often onion or shallot and herbs, reduced to a paste).
Cajun cuisine
The aromatic vegetables green bell pepper (), onion, and celery are called the holy trinity by Cajun chefs in Cajun and Louisiana Creole cuisines. Roughly diced and combined in cooking, the method is similar to the use of the "mirepoix" in traditional French cuisine which blends roughly diced carrot, onion, and celery. Characteristic aromatics for the Creole version may also include parsley, bay leaf, green onions, dried cayenne pepper, and dried black pepper.