Chill a glass salad bowl in freezer for at least 30 minutes.
For dressing, mix all ingredients in a blender until well mixed (add a little sugar if too tart).
Chill in refrigerator for 30 minutes.
Place the salad mix in chilled bowl.
On top, layer red onion, black olives, pepperoncini, tomatoes and croutons.
Add freshly grated Parmesan cheese.
Drizzle with dressing and serve.