
The holy trinity of French cooking — onion, carrot, and celery — comes together here in a slow, buttery sauté that forms the aromatic backbone of countless dishes. Cooked low and slow until pale, fragrant, and meltingly tender, this classic base transforms soups, stews, braises, and sauces from flat to deeply savory with almost no effort. Every ingredient in this recipe is naturally free of barley, which can sneak into pre-made stocks, seasoning blends, and store-bought flavor bases in ways that are easy to miss. Making your own mirepoix from scratch puts you fully in control of what goes into your cooking foundation. The technique is simple — just butter, a handful of fresh vegetables, salt, and patience — but the payoff is enormous. Keep a batch in the fridge and you're already halfway to a great meal on any given weeknight.
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Melt the butter in a large skillet or saucepan over medium-low heat until foamy and just beginning to subside.
Add the onion, carrots, celery, and salt, then stir to coat everything in the butter. Add the bay leaf, if using.
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