What Is a Substitute for Cornstarch?
QUICK ANSWER
The best cornstarch substitute depends on the recipe. For 1-to-1 swaps: arrowroot, tapioca starch, or potato starch. For flour (less efficient): use 2 tablespoons of flour for 1 tablespoon of cornstarch. Arrowroot works best in acidic sauces; tapioca handles freezing best.
Cornstarch is a thickener that creates a smooth, glossy texture in sauces, gravies, and pie fillings. Substitutes work, but each has different behavior with heat, acid, and freezing. The right swap depends on the recipe more than personal preference.
What's the best cornstarch substitute for thickening sauces?
Arrowroot is the closest 1-to-1 substitute: use 1 tablespoon of arrowroot for 1 tablespoon of cornstarch. Arrowroot makes a clearer, glossier sauce than cornstarch and works well in fruit pie fillings.
Tapioca starch is also a 1-to-1 swap and excels in dishes you plan to freeze (it doesn't break down when reheated). Potato starch is another 1-to-1 substitute that handles higher cooking temperatures better than cornstarch.
Can you use flour instead of cornstarch?
Yes, but flour is less efficient as a thickener. Use 2 tablespoons of all-purpose flour for every 1 tablespoon of cornstarch the recipe calls for. The result will be slightly cloudy and less glossy than a cornstarch-thickened sauce.
Flour-thickened sauces need to be cooked longer to remove the raw flour taste (about 2-3 minutes of simmering). For a smoother result, make a roux first by cooking the flour with butter or oil before adding the liquid.
How do thickeners differ in performance?
Cornstarch and potato starch break down when frozen or reheated, becoming runny. Arrowroot breaks down in acidic sauces (with vinegar or citrus) but stays stable in freezing. Tapioca starch handles freezing and acid both, which makes it the best choice for fruit pie fillings and freezer-friendly sauces.
For gluten-free recipes, all of these substitutes are gluten-free except all-purpose flour. For paleo or grain-free baking, arrowroot and tapioca are the best choices since they come from tropical plants rather than grains.
When does the cornstarch substitute fail?
For Asian dishes that depend on cornstarch's specific glossy finish (sweet and sour sauce, mongolian beef), the substitutes work but the texture won't be identical. Arrowroot comes closest visually.
For pie fillings that need to set firmly when cooled (lemon meringue, coconut cream), cornstarch is more reliable than substitutes. Tapioca starch is the closest functional match. For meringues and macarons that use cornstarch as a stabilizer, the substitutes don't reliably replicate the effect.
Best cornstarch substitutes by use: arrowroot (1-to-1, best for acidic sauces and clarity), tapioca starch (1-to-1, best for freezing), potato starch (1-to-1, high heat tolerance), or flour (2-to-1, less efficient but always available).
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