A Roux (pronounced Roo) is the basis for
most stews and gumbos. Roux may also be added to gravies to thicken.
It consists of equal parts of flour and oil. Here's how it's done.
Heat the oil in a heavy pot. When the oil is hot, gradually add flour,
stirring continuously until well mixed. Lower flame and continue
stirring until roux is the desired color. A light roux is generally
the color of a new penny, while a dark roux is the color of an old
penny.
Note: The key is to stir continuously. There's nothing worse than a
burnt roux! If it has black specks in it, it is burned and you have to
start all over again!
Remove from fire and add seasoning (generally cut up Onions, Bell
Peppers and Celery, sometimes called the Cajun trinity).
Return to fire and simmer until wilted. Now is the time to add water
according to how thick or thin you like. You can add salt, pepper
and/or other seasonings to taste.