In the meantime, prepare the white sauce. Melt the butter in a medium pot, add the flour and cook for 1 minute while stirring with a round whisk. Add the warm half & half little by little while stirring constantly. Create a past with no lumps and keep adding the half & half. You’ll end up with a cream, keep stirring and raise the heat to medium high. Wait until it boils and cook for 1 minute more. Season with salt, nutmeg and pepper.