Mac & Cheese
  1. Precook macaroni and set aside; do not rinse.
  2. In a medium saucepan, melt butter over medium heat. Add flour and cook, stirring for about 2 minutes.
  3. Add milk one-third at a time, stirring with a whisk to avoid lumps.
  4. Whisk in dry mustard, salt, and pepper.
  5. Make sure all cheeses are at room temperature and add all at once. Stir until smooth,
  6. add cooked macaroni, and heat through. The cheese sauce will thicken as you reheat.