What is a common thickening agent used in sauces?

Cornstarch is a common thickening agent used in sauces due to its unique properties that contribute to achieving the desired consistency and texture. When combined with a liquid and heated, cornstarch granules swell and absorb water, creating a gel-like consistency that thickens the sauce effectively. This process, known as gelatinization, enhances not only the thickness but also the mouthfeel of the sauce, making it smooth and more cohesive.

Moreover, cornstarch is favored in many culinary applications because it has a neutral flavor, allowing the primary tastes of the sauce to shine through without being overshadowed. It is also gluten-free, which makes it an excellent option for thickening sauces in dishes meant for those with gluten sensitivities.

While flour, gelatin, and butter can also serve as thickeners, they work in different ways and have specific applications. Flour requires cooking to eliminate its raw taste, gelatin must be dissolved and rehydrated, and butter primarily adds richness rather than thickening on its own. Thus, cornstarch stands out as the most common and versatile choice for thickening sauces.