
Butter and flour come together in this classic roux, building the kind of silky, deeply satisfying base that elevates everything from a simple béchamel to a rich velouté. 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 note that makes the finished sauce feel genuinely homemade rather than just functional. Because the ingredient list is so clean and simple, there's no need to scan labels or second-guess what's hiding in a store-bought sauce mix. It works beautifully as a jumping-off point for any creamy dish that calls for a white sauce, and the make-ahead instructions mean you can stash tablespoon portions in the freezer for whenever inspiration strikes. Stir in a little fresh parsley just before serving and you've got something that tastes far more considered than the effort involved.
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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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