Asparagus with Walnuts and Vinaigrette

Description
Perfect in springtime, asparagus' natural sweetness contrasts beautifully with this tart vinaigrette.

Ingredients

 * 1 pound fresh Asparagus, trimmed
 * 1/4 small Onion, very finely chopped
 * 2 tablespoons white wine vinegar
 * 1 teaspoon Dijon Mustard
 * 1/2 packet Sugar Substitute
 * 1/2 teaspoon salt
 * 1/4 teaspoon Pepper
 * 1/4 cup Olive Oil
 * 1 pinch salt
 * freshly ground Black Pepper
 * 4 cups spring salad mix ( Mesclun)
 * 1/4 cup toasted Walnuts, or Almonds

Directions
1. Steam asparagus until crisp-tender. Drain, and pat dry with paper towels. Set aside. 2. Combine shallot, vinegar, mustard and Sugar substitute, salt and pepper in a mixing bowl. Gradually whisk in oil. 3. Divide lettuce on 4 plates; arrange asparagus on top and drizzle with vinaigrette. Sprinkle with walnuts.