What Is a Roux?
A roux is a foundational cooking technique that combines equal parts fat and flour to thicken sauces, soups, and gravies. The fat can be butter, bacon grease, lard, or even oil—though traditionally, butter is preferred for its flavor and consistency.
The classic roux ratio is 1:1 by volume: for example, 4 tablespoons of flour to 4 tablespoons of fat. Adjustments can be made based on your recipe’s texture and thickness needs.
Types of Roux (With Color and Flavor Guide)
- Roux Blanc — Pale, barely cooked; used in delicate sauces like bechamel
- Roux Blond — Light golden color; subtle nutty flavor; great for gravies
- Roux Brun — Medium brown; nutty aroma; adds depth to soups
- Roux Dark — Deep, chocolatey brown; rich flavor; perfect for gumbo
The longer you cook a roux, the more flavor it develops—but it will thicken less.
Common Roux Mistakes (And How to Avoid Them)
- Wrong Ratios: If you eyeball instead of measure, you may end up with too thick or too thin a base. Too much flour can create a cakey texture or cause over-thickening as the dish cools.
- Burning: Cooking over high heat without stirring can easily scorch the roux.
- Clumping: Add the flour slowly while whisking to prevent lumps.
- Weak Fat Choice: While oil can be used, saturated fats like butter, bacon grease, or lard produce better flavor and consistency.
What Roux Looks and Smells Like
At the beginning, a roux should resemble a grainy batter or paste. As it cooks, it will become smoother and darker, with a richer smell. You’re essentially toasting the flour and browning the fat—this is where flavor lives!
Can You Make Roux Ahead of Time?
While many chefs do prep roux in advance and store it refrigerated or frozen, this guide recommends using roux fresh and hot for best results. It thickens more smoothly and bonds with liquids more effectively when used immediately.
How to Use Roux
Once your roux reaches the color you want, add a liquid (such as broth, milk, or water) directly to the pan while whisking. The roux will instantly begin thickening the liquid into a sauce or soup base.
Common recipes that start with roux:
- Sauces: Bechamel, Alfredo
- Gravies: White gravy, brown gravy
- Soups: Baked potato, gumbo, chicken noodle, chowders
Coming soon: Our Easy Bechamel Sauce Recipe for Beginners!
Ingredients for Basic Roux
- 4 tablespoons flour
- 4 tablespoons fat (butter, lard, bacon grease, or oil)
Instructions
- Melt fat in a pan over medium heat.
- Add flour while whisking to create a smooth paste.
- Continue cooking until desired color and aroma develops.
- Add liquid (broth, milk, etc.) to transform into a sauce or soup base.
