Three types of beans are topped with a simple dressing in this chilled side salad. A great recipe for a potluck or family cookout.
Combine green beans with enough salted water to cover. Bring to a boil over high heat. Reduce heat to medium and cook 10 minutes or until crisp-tender; drain and rinse. In a large bowl, combine green beans with black beans and chickpeas. Set aside.
In a small saucepan, stir together onion, vinegar and sugar. Cook over medium heat just until sugar dissolves. Remove from heat. Whisk in oil, mustard, and black pepper. Add to bean mixture; toss to coat. Cover and chill for 4 to 12 hours, stirring occasionally.