Preheat oven to 400F.

Place macaroni in a large heat proof bowl, pour boiling water over top with a pinch of salt. After 5 minutes stir the pasta to ensure that it does not stick together. Let sit for 30 minutes.

As the pasta soaks, in a saucepan, melt butter over medium heat. Once melted, whisk in the flour and cook until golden making a roux, about 1 minute.

Slowly add the milk stirring constantly, heat until thickened and bubbling at the edges, about 4 minutes.

Remove from the heat and stir in the cheddar, cayenne, nutmeg, salt and pepper. Set aside.

Once pasta is done soaking, drain and mix with the cheese mixture until well coated.

Transfer to a casserole dish and bake for 25 minutes covered, then uncovered until golden under the broiler, about 5 minutes.