In England, cornstarch is called cornflour, and this is a
clue to what is actually is—flour made from corn. It’s sold in the baking section and often
comes in a 16-ounce box. I use it as a
thickener for sauces, soups and gravies.
Cornstarch, which feels silkier than flour, has a
tendency to clump in the box. Always
dissolve it in cold water, stirring thoroughly to make sure no lumps
remain. If you add cornstarch directly
to a hot liquid, you’ll end up with lots of lumps.