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A thickening agent for sauces and gravies is not a standalone dish but a culinary technique used to give liquids a richer, smoother consistency. Common ingredients include flour, cornstarch, arrowroot, or a roux (a cooked mixture of fat and flour), which are blended into hot liquids. This method is foundational in cuisines worldwide, from French mother sauces to Chinese stir-fry gravies.
Most thickening agents are high in carbohydrates, with minimal fat or protein unless a roux is used. They primarily provide quick energy and small amounts of iron or B vitamins from enriched flour, with a typical serving adding about 20-50 calories.
The science behind thickening involves starch granules absorbing liquid and swelling when heated, a process that's been used for centuries to stretch meals and enhance texture. Nutritionally, it can help make dishes more satiating without adding significant fat or sugar.