Roux (Equal Parts Fat to Flour by Weight)

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unsalted butter (or other fat) — Clarified butter handles higher heat; lard or vegetable oil used in Cajun dark roux; goose fat in French country cooking

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all-purpose flour — Plain wheat flour (10–12% protein); bread flour is too high in gluten, cake flour too low in starch

Melt fat in a heavy-bottomed pan over medium heat. Add flour all at once and stir immediately with a wooden spoon or whisk until a smooth paste forms — no dry pockets. Continue cooking, stirring constantly, until the desired color and aroma are reached: white roux (barely cooked, 2–3 min, floury smell), blonde roux (golden, 5–8 min, nutty), brown roux (mahogany, 15–20 min, toasty), or dark roux (Cajun, 30–45 min, chocolate-coffee, greatly reduced thickening). Once the roux reaches the target color, add hot liquid gradually while whisking vigorously to prevent lumps.

• Weigh fat and flour: volume measures are unreliable because flour compacts. 1:1 by weight is the universal standard, not 1:1 by cup.
• Add hot (or at least warm) liquid to a hot roux — or cool liquid to a cool roux. A cold liquid into a hot roux will steam violently and cause clumping.
• For Cajun dark roux, switch from butter to a neutral oil with a high smoke point (vegetable, canola, or lard) — butter burns before the roux reaches dark color.
• Dark roux loses thickening power progressively: a chocolate-dark roux may need 2–3× the quantity of a white roux to achieve equivalent sauce viscosity.
• Roux can be made in large batches, cooled, and refrigerated for up to 1 week (or frozen for months) without quality loss. Bring back to temperature slowly before adding liquid.
• The classic test for doneness in a white roux: it should smell biscuity, not raw-floury, and the paste should pull cleanly from the pan sides.

• White roux (roux blanc)

  2–3 minutes; used in béchamel, velouté, cream soups; maximum thickening power, raw floury taste cooked out just barely

• Blonde roux (roux blond)

  5–8 minutes; light golden color, nutty aroma; used for velouté mother sauce, soups requiring a richer base

• Brown roux (roux brun)

  15–20 minutes; mahogany-brown, deeply toasty; used in Espagnole sauce and dark meat gravies; thickening power reduced ~25%

• Cajun/Creole dark roux

  30–45 minutes, continuously stirred, often with lard or vegetable oil (not butter) over medium-high; chocolate to brick color; thickening power reduced ~50% but flavors are profound — basis of gumbo and étouffée

• Gluten-free roux

  Rice flour or a 50:50 blend of rice + potato starch substitutes for wheat flour; produces a slightly gummier texture; requires less cooking time to lose raw flavor

• Béchamel (Roux to Milk)

  Direct downstream application: the same 1:1 roux is the foundation, with milk added in calibrated proportion

• Velouté / Espagnole (Stock to Roux)

  White or brown stock replaces milk; same roux base, different liquid and color target

• Slurry (Starch to Cold Water)

  Alternative thickening method — raw starch dispersed in cold liquid, no fat; cleaner finish but less flavor development

1. 1.Le Guide Culinaire — Auguste Escoffier
2. 2.The French Laundry Cookbook — Thomas Keller
3. 3.Sauces: Classical and Contemporary Sauce Making — James Peterson
4. 4.The Professional Chef, 9th ed. — The Culinary Institute of America
5. 5.The Encyclopedia of Cajun & Creole Cuisine — John D. Folse

Confidence: high