1. Combine first 7 ingredients in a small bowl.
2. Bring 8 cups water to a boil in a large saucepan. Add wax beans; cook 5 minutes or until crisp-tender. Drain and plunge into ice water; drain. Combine beans, radishes, and oil in a large bowl; toss to coat. Place bean mixture on a serving platter; drizzle with buttermilk dressing. Top with cheese, pepper, and bacon.