From celeb chef Rachael Ray’s new book, Yum-o! The Family Cookbook. The secret ingredient in this mac ‘n’ cheese is Dijon mustard.
Serves 4 to 6

Ingredients:

2 tablespoons butter
2 tablespoons flour
1 cup chicken stock
1½ cups milk
2 cups sharp cheddar cheese, grated
Salt and pepper
1 tablespoon Dijon mustard
1 pound whole wheat pasta, cooked to al dente
1 head cauliflower, cut into florets and steamed until almost tender, 6-7 minutes
Directions:

In a saucepot, melt the butter over medium-low heat, add flour and cook for 1 minute.
Whisk in chicken stock and milk.
Thicken the sauce for 5 minutes and stir in cheese, season with salt and pepper, and stir in the secret ingredient (the mustard).
Toss sauce with whole wheat pasta and cauliflower.
http://www.fitceleb.com/2008/09/14/rachael-ray--s-whole-wheat-mac--n--ch...