Roux sauce helps thicken anything that it is added to. Watery mushroom soup isn't as appealing as it would be a thick, hearty soup.
Is called a bechamel sauce or a roux.
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.
Roux is basically an emulsive agent -- butter adds the fat.
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Roux is usually used to make a sauce of some kind. Using brown stock with it will most likely give you a delicious brown gravy, as long as you don't mess it up in the process.
A roux is a mixture of equal quantities of butter and plain flour blended together. Small dollops can then be dropped into hot liquids (including tomatoe sauce). Stir till the liquid boils and thickens. More roux can be added at any time
To make a delicious cheese sauce using roux as a key ingredient, start by melting butter in a pan and adding flour to create a roux. Gradually whisk in milk until the mixture thickens. Then, add your choice of cheese and stir until melted and smooth. Season with salt, pepper, and any desired herbs or spices for extra flavor.
Mornay sauce starts out as a bechamel sauce (a basic roux of flour, milk & butter). Then it is added with a cheese, such as gruyere.
To thicken bechamel sauce effectively, you can add a roux made of equal parts butter and flour. Cook the roux for a few minutes before gradually whisking in the bechamel sauce. Alternatively, you can also simmer the sauce for a longer period of time to reduce and thicken it.
I believe you're referring to a roux.
To make a roux for mac and cheese, melt butter in a pan over medium heat, then whisk in flour until smooth. Cook for a few minutes until it turns a light golden color. Gradually whisk in milk until smooth and thickened. This roux can be used as a base for your mac and cheese sauce.
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