I have two articles on the back burner at the moment, and both of them use roux. Roux is a basic that every cook should know about, but for various reasons it's rather shrouded in myth.
Roux is basically a mixture of flour and oil, which are brought together to become a thickening agent for liquids. It is used for anything from gravy, stews, soups and various sauces. The most commonly used oil is butter, clarified or not.
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basics sauce