1 Answer
Corn doesn't contain gluten, so you can substitute cornstarch in sauces and soups that use flour as a thickener. But there are a few things to remember:
Cornstarch is a more powerful thickener than flour, so you'll need less. Start with half as much cornstarch for the flour listed in the recipe.
Cornstarch breaks down faster than flour, so it must be added at the end of cooking. Combine cornstarch with cold water until smooth and stir into the sauce or soup. Bring to a boil; cook and stir until thickened.
Sauces and soups thickened with cornstarch that are chilled and reheated may not maintain the same consistency as when they're fresh.
The protein in flour gives breads, cakes and baked goods their structure. Since cornstarch lacks this protein, it can't be used as a substitute in baked goods. Experiment with rice, tapioca and buckwheat flour and fine cornmeal instead.
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