Essential New Orleans Ingredients

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This combination of onions, celery, and bell pepper may not exactly be a revelation, but the so-called holy trinity underpins nearly all Cajun and Creole dishes. Though the combo has been around a long time, it was only in the 1970s and '80s that Paul Prudhomme popularized the specific term, which some Catholics find sacrilegious—still, everyone uses the trio of ingredients as a base for gumbo, jambalaya, and étouffée.