- Place potatoes in large saucepan; add enough cold water to cover. Cover saucepan; bring to boil. Reduce heat; simmer, partially covered, 12 minutes, or until potatoes are just tender. Drain; cool slightly.
- Meanwhile, whisk together soy sauce, vinegar, sugar, oil and mustard in large bowl.
- Cut potatoes into eighths. Add potatoes and parsley to dressing; toss together gently to evenly coat all pieces. Cover and refrigerate 2 hours, or until thoroughly chilled.
- Just before serving, sprinkle cheese over salad and gently toss together to combine.