Cornstarch (also called corn flour outside North America) is the pure starch extracted from the endosperm of maize kernels (Zea mays) — a fine, bright-white, silky powder that is almost flavourless and entirely free of protein, fat and gluten. It is the workhorse thickener of kitchens worldwide, prized for the glossy, clear gels it forms when cooked with water.
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