
Mirepoix is one of those foundational building blocks that quietly makes everything taste better — soups, stews, braises, and sauces all owe a serious debt to this humble trio of onion, carrot, and celery. The key here is patience: a slow, gentle cook in unsalted butter coaxes out natural sweetness from the vegetables without any browning, leaving you with something pale, fragrant, and deeply savory. Every single ingredient in this recipe is naturally free of honey and added sweeteners, so there's no label-reading required and no risk of a hidden sweetener sneaking into your base. The optional bay leaf adds a subtle herbal depth that rounds out the flavor beautifully. Once it's done, you can use it right away or stash it in the fridge for up to three days, making it a genuinely useful prep-ahead staple. It's the kind of simple technique that elevates everything it touches.
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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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