
A good roux is the quiet backbone of so many comforting sauces, and this one keeps things beautifully simple with just butter, flour, and a pinch of sea salt. For anyone managing bladder sensitivities, finding a sauce base that skips acidic tomatoes, vinegar, citrus, and other common triggers can feel like a small victory in the kitchen. This recipe delivers exactly that — a pale, gently nutty roux that sets you up for a smooth béchamel or velouté without any of the usual irritants sneaking in. The optional fresh thyme and parsley are mild, bladder-friendly herbs that add a soft, savory lift without overwhelming the dish. The technique is straightforward: constant stirring over medium-low heat for just a few minutes until the paste turns a faint straw color and smells faintly toasty. It comes together quickly and stores well in the fridge or freezer, so you can keep portions on hand for weeknight sauces whenever you need them. Once you have this in your rotation, building a creamy, comforting sauce from scratch becomes genuinely effortless.
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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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