brownish
It is often used as a base for sauce/gravy.
House of Parliament. It is a brown sauce for meats, similar to steak sauce, made by Heinz.
Actually, a roux is not a sauce, but is the base for several different sauces and is used as a thickener in many dishes. A roux is made by combining equal parts of fat and starch (usually butter or lard and flour) and cooking it in a pan until the flour taste has been cooked out. The color of a roux depends upon the amount of time you cook it - and the darker the roux, the more flavor it imparts to the dish you are using it in. By adding milk to a roux you are making a bechamel sauce which is used in many lasagna recipes and other dishes. Bechamel sauce is also the base sauce for several other culinary sauces: Mornay sauce (cheese sauce), Mustard sauce, and Sauce Soubise (contains finely chopped onions that are sweated in butter before adding to the sauce) are a few of these.
Hoisin plum sauce is a good base for a stir fry when some Soy is also added to balance the sweetness.
Supreme sauce is a rich, creamy sauce with a chicken velouté base. See related links for a recipe.
Sauce Supreme
its a tomato base sauce..
Acid
its an acid
For a powdered-based smoky flavor, you have a couple of choices. There is a Hickory Smoke spice on a Malto-Dextrin Base used in commerical sauage making and Hickory Smoke Salt used for barbeque sauce, gravy, and sauces. Both types can be purchased at www.thespicehouse.com. Ronski
Cocktail sauce is a red sauce that is tomato based and slightly spicy. A mayonnaise sauce as the name implies has a mayonnaise base which typically has lemon juice and pickles added.
A roux is exactly what you have described equal parts of either oil, butter, or even fat drippings mixed with flour heated over a low medium heat it is the base for many brown or white sauces and gravy. Also can be used to thicken a sauce or gravy. As the flour heats it gets thicker adding water will thin the sauce or gravy until it cools. When it cools it will thicken slightly. A roux is at its simplest flour cooked (i.e. fried) in any fat or oil, it is used as a base or thickener in many sauces or soups. As it cooks the flour turns color from white, to tan, to brown, to black depending on cooking time and intensity of flavor desired. Preparing a good black roux is very tricky as its very easy to burn, producing an unpleasant scorched flavor, but a few dishes (e.g. some Cajun recipes) require black roux.