
Mirepoix is one of those foundational kitchen preparations that quietly makes everything else taste better โ soups richer, braises deeper, sauces more complex. This version keeps things beautifully simple: onion, carrot, and celery slowly coaxed in butter until they're soft, pale, and wonderfully fragrant. The low-and-slow approach is the whole secret, letting the vegetables sweeten and mellow without picking up any color or bitterness. A bay leaf adds a subtle herbal note while everything gently steams and softens together. Because the ingredient list is so clean and straightforward, there's zero concern about hidden nuts or cross-contamination from processed products โ just whole vegetables and butter doing exactly what they're supposed to do. Make a batch and use it right away as the backbone of a weeknight soup or stew, or stash it in the fridge to give yourself a serious head start on the next few days of cooking.
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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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