What to look for
Choose a dry, free-flowing package and check labeling if corn avoidance or cross-contact matters. Cornstarch is not the same as cornmeal.
Store it thoughtfully
Seal it in a dry cupboard; humidity creates stubborn lumps. Use a clean, dry spoon every time.
How to use it
Mix it with cool liquid into a smooth slurry before adding it to simmering liquid. Stir while the sauce returns to a simmer, then judge the final thickness.
When you need a substitute
Arrowroot can work in some clear sauces but behaves differently with dairy and prolonged heat. Flour gives a more opaque result and generally needs more cooking.
A common pitfallAdding dry cornstarch directly to hot sauce creates lumps that are difficult to remove.
Substitutions change flavor, texture, and sometimes safety or structure. Check the recipe and product labels, especially for dietary needs.
