Process first 9 ingredients in a food processor until smooth, stopping to scrape down sides. Cover vinaigrette, and chill 2 hours.
Marinate green beans, olives, and tomato halves in the vinaigrette 30 minutes; drain. Serve marinated items on a large platter with Mediterranean Pasta Salad, tuna, hard-cooked eggs, capers, and red onions.
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