
Few building blocks in cooking are as quietly powerful as a well-made mirepoix. Onion, carrot, and celery are slowly coaxed in butter until they turn pale, soft, and deeply fragrant โ creating a savory foundation that makes everything you build on top of it taste richer and more complex. Because the vegetables are cooked low and slow rather than browned, you get a gentle, rounded sweetness that disappears into soups, stews, braises, and sauces without announcing itself. Every single ingredient here is whole and unprocessed, which means there's no guesswork about hidden additives or flavor enhancers sneaking into your cooking. A pinch of kosher salt and an optional bay leaf are all the seasoning you need โ proof that real flavor doesn't require anything artificial. Make a batch now and use it right away, or stash it in the fridge for up to three days so you've always got a head start on a deeply satisfying homemade meal.
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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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