Cornstarch corn starch (or corn flour) is a fine, powdery flour made from the endosperm of corn kernels. We use cornstarch as a thickener for sauces, puddings and even stir-fries. To avoid lumps always mix cornstarch with liquid before adding it to the dish you wish to thicken. Both spellings, cornstarch and corn starch are correct. The single word cornstarch is common in the U.S. and Canada.
If you don't have cornstarch you can substitute one of the following per tablespoon needed:
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If you are on a Keto or other low carb eating plan then you may want a thickener that is lower in carbohydrates such as: