2026 Oct 10th
What a slurry is, how to use one without lumps, how it differs from a roux and a reduction, and the starches for a fast-thickening sauce station.
A slurry is starch, such as cornstarch, flour, or arrowroot, whisked smooth with cold liquid and then stirred into a hot sauce, gravy, or soup near the end of cooking to thicken it quickly. A short simmer activates the starch. Unlike a roux, there is no cooked fat-and-flour base.
Mix cornstarch, flour, or arrowroot with cold water or cold stock until lump-free.
Starch added straight to hot liquid clumps. The cold mix disperses it first.
Whisk it in near the end when tickets are moving.
A short simmer activates the starch so the sauce coats a spoon.
Prolonged hard boiling can thin some starch-thickened sauces.
Cornstarch slurries give the glossy coat common in stir-fry sauces.
A slurry is starch mixed smooth with cold liquid. When it hits a hot sauce or soup, the starch swells and thickens the liquid. Because the starch is already dispersed in cold liquid, it does not clump the way dry starch would.
It is the quick alternative to a roux. A roux builds a cooked fat-and-flour base at the start. A slurry goes in at the end when you need speed or a clearer, glossier sauce.
| Factor | Slurry | Roux | Reduction |
|---|---|---|---|
| Made of | Starch and cold liquid | Fat and flour cooked together | The sauce itself |
| When it goes in | Near the end | At the start | Throughout the simmer |
| How it thickens | Starch swells in hot liquid | Cooked flour thickens the liquid added | Water evaporates |
| Speed | Fast | Slower, needs a cook-out | Slow |
| Look | Clear and glossy, especially cornstarch | Opaque | Concentrated, darker |
Reach for a slurry when the sauce needs body fast.
Corn starch for glossy slurries and stir-fry sauces.
Bulk corn starch for high-volume sauce work.
Gluten-free corn starch in a bulk bag.
Arrowroot starch for clear, glossy sauces.
Potato starch for quick thickening.
Tapioca flour, another starch for slurries.
A slurry is starch whisked smooth with cold liquid, then stirred into a hot sauce or soup near the end to thicken it quickly.
Cornstarch, flour, or arrowroot are common. Cornstarch is common in glossy stir-fry sauces.
Cold liquid disperses the starch evenly. Dry starch added straight to hot liquid clumps into lumps.
A roux cooks fat and flour together first. A slurry is starch and cold liquid added at the end, with no fat.
Near the end, into a gently simmering sauce, gravy, or soup.
Yes, briefly. A short simmer activates the starch so the sauce thickens and coats a spoon.
Prolonged hard boiling can thin or break some starch thickeners. Simmer briefly, then hold.
Whisk the starch and cold liquid completely smooth, re-whisk right before pouring, and whisk it into the sauce in a steady stream.
No. A reduction thickens by evaporating liquid. A slurry thickens with starch.
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Canadian foodservice supplies for sauce stations: corn starch, arrowroot, potato starch, and tapioca. Chicken Pieces is a Calgary foodservice and hospitality supply company founded in 2018. We supply pantry ingredients and kitchen supplies for this work. We are not a poultry or meat distributor.
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Chicken Pieces is a Calgary foodservice and hospitality supply company founded in 2018, not a poultry or meat distributor. We write for operators working under CFIA- and Health Canada-aware food-safety plans.
References: Health Canada - Food Chemical Contaminants CFIA - Food Safety for Industry.
