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Cornflour
Flours & Starches

Cornflour

Taste Profile Completely Neutral, mildly Chalky when raw, absolutely undetectable when cooked correctly, yielding a smooth, glossy mouthfeel.

The ultimate, transparent thickening engine of the kitchen. Extracted purely from the endosperm of the corn kernel, this is an ultra-fine, pure white starch (known as cornstarch in the US). Crucially, in the UK and Polish culinary context, it must never be confused with yellow cornmeal (mąka kukurydziana). Because it contains no protein or gluten, it possesses roughly double the thickening power of standard wheat flour. Where wheat flour creates heavy, opaque sauces with a distinct bready flavour, cornflour yields a brilliant, translucent gloss and a delicate, clean texture, making it indispensable for bright fruit pie fillings, slick Asian-style stir-fry glazes, and pure dairy puddings.

Culinary Notes

The Slurry Rule (Crucial): You must never dump dry cornflour directly into a hot liquid. It will instantly scald and clump into impenetrable, gelatinous lumps that no amount of aggressive whisking can ever dissolve. You must always create a "slurry" first—whisking the exact measure of starch with an equal amount of cold water or milk until perfectly smooth—before stirring it into the simmering pot.

The Boiling Mandate: Cornflour requires serious heat to activate its full thickening potential and to destroy its raw, chalky texture. The liquid it is added to must reach a full rolling boil for at least 60 seconds. Before it boils, the sauce will look deceptively thin, tempting you to add more starch—do not do this, or it will turn into solid glue once it cools.

The Overworking Warning: Once your sauce or custard has boiled and reached its peak glossy thickness, take it off the heat immediately. Prolonged, aggressive boiling or excessive, fierce whisking will physically shatter the delicate starch chains, causing the sauce to instantly thin out and turn back to a watery liquid.

The Glass-Crust Fry: Beyond thickening liquids, cornflour is a spectacular tool for high-heat frying. Tossing chunks of chicken or tofu in pure, dry cornflour before dropping them into hot oil creates a shatteringly crisp, glass-like crust that holds up remarkably well under sticky, wet sauces.

Health & Folklore

Naturally Gluten-Free: Because it is entirely pure starch derived from corn, it is completely free from gluten, making it a perfectly safe and highly reliable structural thickener and binder for coeliacs.

Rapid Digestion: As a simple, refined carbohydrate, it provides an immediate, dense source of easily digestible energy without stressing the stomach.

Low Sodium and Fat: Contains virtually zero fat, cholesterol, or sodium, acting purely as a textural agent without altering the nutritional profile of the fat in the dish.
Keeper's Tip

Worthy Substitutes

Potato Starch (Mąka Ziemniaczana): (The absolute best, direct swap. It behaves almost identically, yielding the exact same clear, glossy finish, and is historically much more prevalent in the traditional Polish kitchen for creating kisiel or thickening fruit compotes. It thickens at a slightly lower temperature than cornflour).

Arrowroot Powder: (Provides an extraordinarily clear, beautiful gloss for fruit sauces, but it breaks down completely if combined with dairy—use it only for clear, water- or juice-based liquids).

Plain Wheat Flour: (A poor direct swap. You will need to use double the amount, it will make the sauce cloudy and heavy, and it must be cooked out in fat first as a roux to avoid a raw wheat taste).

Used in these Recipes