Snap off and discard the woody bases of the fresh aspargus. Cook the fresh asparagus, covered, in a small amount of boiling water for 8-10 minutes. Or better yet steam for 8-10 minutes till tender. If frozen, cook according to package directions. Drain asparagus; transfer to a serving platter and keep warm.
To make the sauce:
In a small saucepan stir together milk and cornstarch. Cook and stir over medium heat until the mixture is thickened and bubbly. Cook and stir for 2 minutes more. Stir in mustard and pepper.
Spoon sauce atop asparagus. Sprinkle with Parmesan cheese. Enjoy!