In a stock pot boil Water. Once water is boiling add the Salt and Elbow Macaroni to the pot for about 5 minutes or until the macaroni is cooked to your liking. I like mine a little past aldente since this is stove top.
Cut the Sausage Links diagonally. Then put them in a pan on medium heat moving them around every 30 seconds for about 5 minutes or until all sides are browned. Remove the sausages from the pan. Do not remove the sausage oil.
Turn the heat down to medium-low and add the butter until melted, but do not brown.
As soon as the butter is melted add the remainder of the the dry ingredients: Flour, Mustard Powder & Black Pepper. Whisk constantly for about 2 minutes so the flour cooks.
Pour in the milk and whisk until the mixture becomes a creamy bechamel sauce. If the sauce is too thick you can add more milk. It all depends on how creamy you like your macaroni and cheese.
Turn off the heat when the sauce is the desired consistency. Sprinkle in the cheese. You may use more or less cheese based on your taste.
Once the mac is mixed well with the cheese, put the sausage and any remaining juices back into the pot and fold into the macaroni and cheese mixture.