1Fill 5-quart Dutch oven two-thirds full of water; heat to boiling. Add beans; boil 1 minute. Add vermicelli; boil 6 minutes. Drain. Rinse with cold water to cool; drain and return to Dutch oven. Add 1/2 cup of the dressing; toss to coat.
2Divide vermicelli mixture evenly among 4 serving plates. Mound one-fourth of the tuna in center of each plate; surround with olives, eggs and radishes. Drizzle remaining 1/4 cup dressing over salads.