1. Combine oil, rind, 2 tablespoons lemon juice, thyme, 1/2 teaspoon pepper, and salt in a large bowl, stirring with a whisk.
2. Bring 8 cups water to a boil in a large saucepan. Add wax beans; cook 2 minutes. Add fava beans to wax beans in pan; cook an additional 2 minutes or until beans are tender. Drain and rinse with cold water. Drain. Add bean mixture, cherry tomatoes, onion, and chickpeas to dressing; toss well.
3. Combine remaining 1 1/2 tablespoons lemon juice, remaining 1/4 teaspoon pepper, mayonnaise, and chives in a small bowl, stirring with a whisk. Let stand 10 minutes. Drizzle mayonnaise mixture over bean mixture.
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