Procedure
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Drop asparagus into a large saucepan of boiling water, and cook 1 minute;
drain. Rinse asparagus under cold water; drain. Cut asparagus spears
into 1 inch pieces. Combine asparagus, broth, leek, celery, and ham in
pan; bring to a simmer over medium heat, and cook 3 minutes. Add cheeses;
stir until cheeses melt. Combine 1 tablespoon water and cornstarch; stir
well, and add to asparagus mixture. Bring to a simmer; cook 3 minutes or
until slightly thick, stirring constantly. Combine sauce and spaghetti in
a bowl; toss well. Garnish with parsley, if desired.