
Butter and flour come together in this classic roux, cooked low and slow until it reaches that pale, faintly nutty straw color that signals it's ready to do its job. It's the kind of foundational technique that unlocks a whole world of creamy sauces — béchamel, velouté, and beyond — all from just a handful of pantry staples. Optional fresh thyme and parsley add a quiet herbal lift that makes the finished sauce feel a little more special without complicating the process. For anyone navigating lupin sensitivities, this recipe is reassuringly straightforward: it relies on plain all-purpose flour rather than any legume-derived flour alternative, so there's no guesswork about what's in the base of your sauce. The method is forgiving and repeatable, and the make-ahead instructions mean you can stash portions in the freezer and pull them out whenever a creamy sauce is on the menu. Once you've made this a couple of times, it becomes second nature — and your homemade sauces will never be the same.
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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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