1. Whisk together first 6 ingredients in a small bowl.
2. Combine 1/4 cup dressing with napa cabbage and remaining ingredients, tossing well to coat. Cover mixture, and refrigerate at least 3 hours. Refrigerate remaining dressing, covered, up to two weeks.
Note: Ginger Extract contains few calories and no fat or cholesterol, so these values are not included in the salad's nutritional analysis.