Turkey-and-Watercress Salad

In a medium saucepan, bring 6 cups water to a boil. Add 2 teaspoons salt and farro; cook until tender, 18 to 20 minutes. Drain and let cool completely, about 1 hour.

Meanwhile, whisk together mustard, cranberry sauce, and vinegar. Season with salt and pepper. Whisk in oil. Toss farro with turkey, celery, celery leaves, and 1/3 cup dressing. Just before serving, fold in watercress and season with more salt and pepper. Serve, with remaining dressing on the side.