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A thickener is a foundational culinary component used to give body, texture, and richness to soups, stews, and gravies. Common ingredients include flour, cornstarch, arrowroot, or a roux (a paste of fat and flour), which are mixed with liquid to create a smooth, viscous sauce. While the technique is universal, its specific forms vary widely across global cuisines, from French roux to Japanese kuzu.
Typically high in carbohydrates from starches like flour or corn, with a moderate amount of fat if a roux is used. A standard serving (about 1 tablespoon of a flour-based thickener) provides roughly 30-50 calories, primarily from starch, with minimal protein or other nutrients.
The art of making a roux is a cornerstone of Cajun and Creole cooking, where its color (from blonde to dark brown) is carefully developed to impart deep, nutty flavors. Nutritionally, using a thickener can help slow the absorption of sugars from the broth, potentially making the meal more satiating.