{"schema":"askedwell-earned-page-v1","url":"https://askedwell.com/pages/what-ratio-of/roux-fat-flour","question":"What is the right ratio of fat to flour for a roux?","short_answer":"Classic roux is 1:1 fat-to-flour by WEIGHT (not volume). 1 oz butter + 1 oz flour = 2 oz roux thickens ~1 quart liquid. Type determines color: white (2 min), blonde (5 min), brown (10 min), dark/cajun (30+ min).","long_answer":"Roux is the French culinary base — equal parts fat and flour cooked together, then used to thicken sauces, gravies, and soups. The ratio is precise but the cook time + temperature determine the color + flavor.\n\n**Standard ratio: 1:1 by weight**\n- 28g butter + 28g flour = 56g roux\n- 1 oz butter + 1 oz flour = 2 oz roux\n- 2 tbsp butter + 2 tbsp flour = 4 tbsp roux (close enough to 1:1 by weight)\n\n**Why weight, not volume:**\n- 2 tbsp butter weighs 28g; 2 tbsp flour weighs 16g\n- Volume ratio works approximately because butter melts and disperses\n- Weight ratio is precise: 1:1 always\n\n**Roux types by color + cook time:**\n\n**White roux (béchamel, white sauces):**\n- Cook time: 1–2 minutes (very brief; just removes raw flour taste)\n- Color: pale yellow\n- Use: béchamel, mac and cheese, alfredo, white pizza sauce\n- Thickening power: highest (least Maillard, most pure starch)\n\n**Blonde roux (light gravies, velouté):**\n- Cook time: 3–5 minutes\n- Color: light golden\n- Use: velouté, light gravies, sauce normande\n- Thickening power: slightly less than white (slight Maillard breakdown)\n\n**Brown roux (red sauces, gravy):**\n- Cook time: 10–15 minutes\n- Color: peanut-butter brown\n- Use: brown gravy, espagnole, beef stew, mushroom sauces\n- Thickening power: reduced by ~25%\n- Flavor: nutty, complex\n\n**Dark/Cajun roux (gumbo):**\n- Cook time: 30–45 minutes (some chefs 60+ minutes)\n- Color: chocolate-brown to mahogany\n- Use: Cajun gumbo (Louisiana classic)\n- Thickening power: very low (~50% of white roux)\n- Flavor: deep nutty, almost like chocolate\n- \"The roux is the soul of gumbo\"\n\n**Method:**\n1. Melt fat (butter, oil, or animal fat) in heavy-bottomed pan at medium heat\n2. Add flour all at once\n3. Whisk constantly to combine\n4. Continue whisking as it cooks to target color\n5. Add liquid gradually while whisking to prevent lumps\n\n**Thickening capacity:**\n- 1 oz (28g) roux thickens ~1 quart (32 oz) of liquid to medium sauce consistency\n- 1.5 oz roux for thick gravy\n- 0.5 oz roux for thin sauce\n- Cajun-dark roux: use 1.5-2× more for same thickening\n\n**Fat type variations:**\n- **Butter (classic French)**: rich, milky, browns quickly. Standard for béchamel + white sauces.\n- **Vegetable oil**: more neutral, withstands higher temps; used for dark roux + Cajun (canola, peanut, sunflower)\n- **Animal fat (bacon grease, schmaltz, duck fat)**: deeper flavor, traditional for some applications\n- **Ghee/clarified butter**: highest smoke point, premium choice for medium-dark roux\n\n**The \"cold roux + hot liquid\" or \"hot roux + cold liquid\" rule:**\n- One must be cold, the other hot, for smooth thickening\n- Both same temp = lumps + uneven thickening\n- Standard: roux cools 30 sec while whisking liquid into it; OR roux + cold milk whisked together off heat\n\n**Don't:**\n- Skip the cook (raw flour taste in finished sauce)\n- Stop whisking dark roux (burns in seconds — burned roux = bitter unusable)\n- Cook over high heat (uneven; burns flour before fat properly absorbs)\n- Add wet liquid all at once (lumps); whisk in slowly\n\n**Variations + alternatives:**\n- **Beurre manié**: equal-parts cold butter + flour kneaded together; whisked into hot liquid; no cooking. Same thickening, no roux flavor.\n- **Cornstarch slurry**: 1 tbsp cornstarch + 2 tbsp cold water; whisked into hot liquid; thickens immediately. Glossier, lighter than roux.\n- **Arrowroot slurry**: similar to cornstarch but freezes/reheats better\n- **Reduction**: just simmer liquid until thickened (no thickener); time-consuming but flavor-intense\n\n**Cross-reference:** see /pages/how-long-does/caramelizing-onions for similar Maillard-reaction methodology + /pages/how-long-does/pizza-dough-rise for related ratio-based cooking.\n\nMost published references (Julia Child \"Mastering the Art\", Auguste Escoffier \"Le Guide Culinaire\", Joy of Cooking, Paul Prudhomme \"Chef Paul Prudhomme's Louisiana Kitchen\") converge on 1:1 by weight as the classical standard.","duration_iso":"PT0M","ranges":[{"condition":"White roux (béchamel)","duration":"1:1 ratio, 1–2 min cook"},{"condition":"Blonde roux (velouté)","duration":"1:1 ratio, 3–5 min cook"},{"condition":"Brown roux (beef gravy)","duration":"1:1 ratio, 10–15 min cook"},{"condition":"Dark Cajun roux (gumbo)","duration":"1:1 ratio, 30–45+ min cook"},{"condition":"Thickening capacity per oz","duration":"1 oz roux thickens ~1 quart liquid"}],"variables":[{"name":"Fat type","effect":"Butter for white/blonde; oil for brown/dark (withstands long cook better)"},{"name":"Cook time","effect":"Determines color + flavor; longer = darker + nuttier + less thickening power"},{"name":"Flour type","effect":"All-purpose standard; bread flour adds slightly more thickening; whole wheat works but produces grittier sauce"},{"name":"Temperature","effect":"Medium heat ideal; high = burn; low = won't darken"}],"sources":[{"label":"Julia Child + Simone Beck, \"Mastering the Art of French Cooking, Vol. 1\"","note":"Canonical English reference for classical French roux methodology"},{"label":"Auguste Escoffier, \"Le Guide Culinaire\" (1903)","note":"Foundational French culinary reference; defines roux for modern cuisine"},{"label":"The Joy of Cooking","note":"Standard home reference for roux + variations + thickening calculations"},{"label":"Paul Prudhomme, \"Chef Paul Prudhomme's Louisiana Kitchen\"","note":"Definitive Cajun cooking + dark roux methodology"}],"faq":[{"question":"Why is the ratio 1:1 by weight, not volume?","answer":"Butter is denser than flour by volume. 1 cup butter = 230g; 1 cup flour = 130g. The 1:1 ratio works by weight because the chemistry (starch absorbs fat) requires specific mass ratios, not volume. Cooking is chemistry; weights are precise."},{"question":"Can I freeze leftover roux?","answer":"Yes — freeze in ice cube trays (1 oz each), bag, use up to 6 months. Saves time for future sauces. Thaw on stovetop while whisking liquid into it."},{"question":"My roux is lumpy when I add liquid — what happened?","answer":"Three causes: (1) hot roux + hot liquid (need temperature contrast); (2) added liquid too fast; (3) didn't whisk continuously. To fix: pour through fine-mesh sieve to remove lumps, or whisk in a blender briefly. For next time: cool roux briefly OR use cold liquid + hot roux."}],"keywords":["roux ratio","roux fat flour","classical french sauce","roux thickening","béchamel","gumbo roux","sauce making"],"category":"cooking","date_published":"2026-05-20","date_modified":"2026-05-20","license":"CC-BY-4.0","attribution":"https://askedwell.com"}