a little salt (optional)
In a medium bowl combine the tuna fish, onions, beans, celery, olives, and capers.
In a small bowl add all the ingredients for the dressing and mix vigorously.
Add the dressing to the tuna fish mixture and toss gently.
Serve on plates garnished with greens and drizzle a little olive oil on top if you like.
This salad can be prepared ahead of time and any left-overs can be stored in the refrigerator for an additional day.