Bring water to a boil in a pot. Add green beans and cook until just crisp-tender, 4 to 5 minutes. Drain and rinse immediately in cold water.
Transfer green beans to a large bowl and stir in corn, black beans, tomatoes, celery, bell pepper, and onion.
Mix apple cider vinegar, sugar, olive oil, salt, and pepper together in a small bowl. Pour over vegetables and stir to coat. Refrigerate, covered, for 4 hours, or up to overnight.
Nutritional Facts
Per 8 servings
Calories: 324
Carbohydrate: 45g
Fat: 14g
Fiber: 7g
Protein: 6g
Sugar: 24g
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