Thicken liquids with starch (roux/flour/cornstarch) to make a smooth, pourable sauce
Control starch gelatinization and amounts to thicken a liquid into a shiny, velvety sauce without lumps.
The chef looks for the ability to make different roux stages (blond, brown, brick) and to use flour or cornstarch appropriately. A successful result is a thickened sauce that is shiny/velvety and pourable (not lumpy or paste-like).
The short version
- A good thickened sauce is smooth, shiny, velvety, and pourable.
- Different roux stages exist (blond, brown, brick).
- Understanding starch gelatinization improves repeatability.
What you need
- saucepanoptionalAny pot/pan suitable for heating liquids
How to do it
- 1
Choose a thickener (e.g., roux, flour, or cornstarch) appropriate for the sauce you’re making.
Roux can be cooked to different stages (blond, brown, brick) depending on desired result.
Watch this step - 2
Add and cook the starch in a controlled way to activate thickening (gelatinization) while avoiding lumps.
The key is understanding how much to use and managing the process, not guessing.
Watch this step - 3
Evaluate the finished sauce: it should be shiny, velvety, and pourable (not "ploppable"), with no lumps.
If it resembles mashed potatoes or cottage cheese, it’s over-thickened or poorly incorporated.
Watch this step
What goes wrong
Lumpy sauce.
Control incorporation and cooking of the starch; manage the gelatinization process.
Over-thickening into a paste-like texture.
Use less starch and stop thickening when the sauce is still pourable.
Why it works
Starches thicken by gelatinization; controlling the process and proportions prevents lumps and over-thickening.
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