Onion, bell pepper and celery, usually with garlic, sweated as the base of nearly everything. Related to French mirepoix and not identical to it: bell pepper replaces carrot, the proportions differ, and the cooking is longer and darker. The name itself is twentieth-century Louisianan.
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What is recorded
The Louisiana trinity is related to French mirepoix by descent and is not identical to it: bell pepper replaces carrot, proportions differ, and the cooking is longer and darker. The name "holy trinity" is a twentieth-century Louisiana coinage, popularised in the Cajun cooking boom.documented