Slowly add the milk, whisking well to avoid lumps, and carry on to whisk right until it thickens right into a sauce. Action two, Make a roux with butter and flour. In essence a roux is usually a cooked paste made with butter and flour. When milk is included later https://travisptohq.elbloglibre.com/18423154/baked-mac-and-cheese-serious-eats-options