Bring a large pot of salted water to a boil. Drop the green beans into water for 2 to 3 minutes until they’re bright green but still crisp. Drain, and transfer to an ice bath. Drain a second time, and transfer the beans to a large bowl.
1 pound green beans
Add the chickpeas, cannellini beans, rosemary, red onion, and the red wine vinaigrette. Toss to combine.
15 ounces chickpeas, 15 ounces cannellini beans, ⅓ cup purple onion, ¼ cup rosemary, ¾ cup red wine vinaigrette
Cover and let the salad set overnight in the refrigerator. The following day, set it out to come to warm slightly, and serve.
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