
Mirepoix is one of those foundational building blocks that makes everything it touches taste more deeply savory and satisfying. This classic trio of onion, carrot, and celery gets gently coaxed in butter over medium-low heat until everything is soft, pale, and wonderfully fragrant — no browning, just pure, sweet aromatics. For anyone navigating a nightshade-free lifestyle, this is genuinely good news, because traditional mirepoix skips tomatoes, peppers, and potatoes entirely and relies on vegetables that are naturally in the clear. The slow, patient cook time is what makes it special: those 15 to 20 minutes transform humble diced vegetables into something that smells like the beginning of every great meal you've ever had. Use it as the base for soups, braises, stews, or sauces and you'll notice the difference immediately. It keeps in the fridge for up to three days, so making a batch ahead is one of the smartest moves you can make for a week of easy, flavorful 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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