1.) Wash and trim fibrous asparagus stalks.
2.) Blanch asparagus in a large pan of salted boiling water until just crisp-tender, about 4 minutes.
3.) Using tongs, transfer asparagus to large bowl of ice water.
4.) Cool asparagus for 1 minute then drain on layers of paper towels
5.) Place asparagus in large bowl
Dressing:
6.) Whisk together vinegar, oil, mustard and salt in a small bowl
Finish:
7.) Drizzle dressing over asparagus and toss gently to coat
8.) Arrange asparagus on serving platter and sprinkle with walnuts and pepper