In covered saucepan, cook broccoli in water until just tender (6-8 minutes). Drain, pat dry on paper towels, and set aside.
In large bowl, whisk together buttermilk, parsley, mustard, oil, vinegar, salt, and pepper. Add the broccoli and toss to coat. Chill up to four hours. When ready to serve, divide broccoli mixture among salad plates, and garnish with walnuts and crumbled goat cheese. 4 servings.