Dressing:
1. In a medium-size bowl or measure cup, whisk together the vinegar, mustard, salt and pepper. While whisking, add oil in a thin stream until blended. Set aside. Salad:
1. Heat a medium-size pot of water to boiling. Add green beans and cook 4 minutes or until crisp-tender. Drain and rinse with cold water. 2. Tear basil into bite-size pieces. In a large bowl, toss basil, green beans, tomatoes, mozzarella, and the kidney and white beans. Whisk dressing, then drizzle over salad. Toss gently to coat and serve.