Mix beans, celery, onions and bok choy. Whisk together vinegar, oil and mustard and toss beans in dressing. Add salt and pepper to taste. Refrigerate at least 1 hour before serving.

This recipe yields 4 servings.

Each serving: 435 calories; 314 mg sodium; 0 cholesterol; 28 grams fat; 36 grams carbohydrates; 13 grams protein; 3.73 grams fiber.