Bring enough water to boil to cover beans and zucchini when added. Add salt and beans. Simmer about 5 minutes.
05Add zucchini and pepper strips and cook about 2 minutes. Drain well.06Run vegetables under cold water to chill well. Drain.07Mix mustard, vinegar, garlic, salt and pepper in a bowl, stirring rapidly with a wire whisk. Add oil, beating vigorously.08Add vegetables, onion and basil to bowl and toss to blend. Serve at room temperature.