A cornstarch slurry is one of the easiest ways to thicken any sauce. Just mix equal parts cornstarch cold water, whisk it smooth, then drizzle it into your simmering sauce. As the starch granules heat up, they swell and trap moisture. Giving you a thick, glossy, restaurant-quality sauce in seconds. Perfect for stir-fries, gravies, soups, and pan sauces. Simple technique, huge difference. | Chef Andrew Gruel