
Mirepoix is one of those foundational kitchen preparations that quietly makes everything else taste better โ soups, stews, braises, and sauces all owe a serious debt to this humble trio of onion, carrot, and celery. The technique here is all about patience and low heat, coaxing the vegetables into something soft, sweet, and deeply fragrant without any browning. Unsalted butter ties it together beautifully, giving the finished base a rich, rounded flavor that water or oil simply can't match. A single optional bay leaf adds a subtle herbal note that feels classic without complicating anything. This is a completely plant-forward preparation โ just vegetables, butter, salt, and time โ so there's no need to navigate poultry-based stocks or broths that can sneak into similar recipes. Make a batch and use it right away, or stash it in the fridge for up to three days so you've always got a flavor-packed head start on your next 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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