
Butter and flour come together in this classic roux to form the backbone of some of the most beloved sauces in cooking — and it happens to be completely free of eggs without any substitutions needed. The technique is straightforward: low heat, constant stirring, and a little patience until the mixture turns a pale straw color and smells faintly nutty. Optional fresh thyme folded in off the heat adds a subtle herbal lift that makes the finished sauce feel a little more special. From there, whisk in warm milk for a silky béchamel or swap in broth for a light velouté — the roux does the heavy lifting either way. A pinch of fresh parsley stirred in just before serving brightens the whole thing beautifully. It also stores well, so you can make a batch ahead and keep portions in the freezer for whenever a creamy sauce is calling your name.
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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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