Green Bean Vinaigrette
["1 (16 oz.) pkg. frozen French-cut green beans", "1/2 c. finely chopped onion", "1/4 c. sliced ripe olives", "1 clove garlic, minced", "1/4 c. olive oil", "2 Tbsp. cider vinegar", "3/4 tsp. dried tarragon", "1/4 tsp. dried basil", "1/4 tsp. salt", "1/4 tsp. pepper", "2 to 4 Tbsp. freshly grated Parmesan cheese", "sliced tomatoes"]
["Cook green beans according to package directions; drain. Plunge into ice water to stop the cooking process.", "Drain and set aside."]
["green beans", "onion", "olives", "clove garlic", "olive oil", "cider vinegar", "tarragon", "dried basil", "salt", "pepper", "Parmesan cheese", "tomatoes"]