Cornstarch is a common thickening agent in the culinary arts, but if you add it directly to the liquid you want to thicken, it will clump up. To thicken a sauce or soup with cornstarch, you first need to make a slurry, which is a mixture of equal parts cornstarch and liquid (usually water, stock or wine).

Is it better to thicken with flour or cornstarch?

Because cornstarch is pure starch, it has twice the thickening power of flour, which is only part starch. Thus, twice as much flour is needed to achieve the same thickening as cornstarch. ... Using flour as a thickener will make the sauce opaque and cloudy while cornstarch leaves a shiny, more translucent finish.

Does cornstarch thicken things?

Cornstarch is one of the most commonly used thickeners, but it has some unique traits. So thanks for the good question! Cornstarch must be cooked to 95°C (203°F) before thickening begins. At that point, it usually thickens fairly quickly and the sauce turns from opaque to transparent.