
Butter, flour, and a little patience are all it takes to build one of the most useful foundations in cooking. This classic roux comes together in just a few minutes on the stovetop, developing a faint, nutty aroma and a pale straw color that signals it's ready to do its job. Optional fresh thyme folded in off the heat adds a quiet herbal note that elevates any sauce it anchors. Because the recipe relies entirely on butter and flour, there's no need to scrutinize labels for hidden meat-based stocks or animal-derived additives — it's straightforwardly plant and dairy based. Use it immediately as the backbone of a silky béchamel or a delicate velouté, or stash it in the fridge for up to three days and in the freezer in tidy tablespoon portions for up to a month. A pinch of fresh parsley stirred into the finished sauce right before serving keeps things bright and aromatic. Once you have this in your repertoire, you'll wonder how you ever got through a week of cooking without it.
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Melt the butter in a small heavy-bottomed saucepan over medium-low heat until fully melted and just beginning to foam, about 1 minute. Do not let it brown.
Add the flour all at once and stir immediately with a wooden spoon or silicone spatula, working the mixture into a smooth paste. Continue stirring constantly for 2–3 minutes, until the roux smells faintly nutty and turns a pale straw color — it should pull away from the sides of the pan slightly and look dry on the surface.
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