
Mirepoix is one of those foundational building blocks that quietly makes everything taste better โ soups, stews, braises, and sauces all owe a serious debt to this humble trio of onion, carrot, and celery. The slow, gentle cook in unsalted butter is what transforms these everyday vegetables into something sweet, fragrant, and deeply savory without a hint of browning. For anyone avoiding black pepper, this is a recipe that genuinely doesn't need it โ the natural sweetness of the carrots, the soft bite of the onion, and the subtle earthiness of the celery do all the heavy lifting on their own. A pinch of kosher salt and an optional bay leaf are the only seasonings here, keeping things clean and completely safe to use as a base without second-guessing any hidden spice blends. The key is patience: low heat and regular stirring coax out the best flavor while keeping the vegetables pale and tender rather than caramelized. Make a batch and stash it in the fridge for up to three days, and you'll have a versatile, pepper-free flavor foundation ready to go whenever you need it.
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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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