To make cornstarch water (also called a cornstarch slurry) for cooking, you mix cornstarch with cold water until smooth. This mixture is then added to hot liquids to thicken them.
Steps to Make Cornstarch Water:
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Combine Cornstarch and Cold Water: In a small bowl, mix equal parts cornstarch and cold water. A general guideline is to use 1 tablespoon of cornstarch for every cup of liquid you want to thicken. So, for example, use 1 tablespoon of cornstarch and 1 tablespoon of cold water.
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Mix Until Smooth: Use a fork or whisk to thoroughly combine the cornstarch and water. Ensure there are no lumps of cornstarch remaining. The mixture should be a smooth, milky liquid.
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Add to Hot Liquid: While the liquid you want to thicken is simmering, slowly pour in the cornstarch slurry. Stir constantly as you pour to prevent clumping.
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Simmer and Stir: Continue to simmer the liquid, stirring frequently, until it reaches the desired thickness. It should thicken quickly.
Important Tips:
- Use Cold Water: Always use cold water to make the slurry. Hot water will cause the cornstarch to clump.
- Don't Add Directly to Hot Liquid: Never add dry cornstarch directly to hot liquid. It will clump instantly.
- Stir Constantly: Stirring is crucial to prevent lumps from forming.
- Simmer Briefly: Once the sauce has thickened, simmer for a minute or two to cook out the starchy flavor.
- Adjust as Needed: If the sauce isn't thick enough, mix a little more cornstarch slurry and add it gradually.
