1. Combine sugar and juice in a small bowl, stirring with a whisk. Add peanut butter, chiles, and salt; stir with a whisk until well combined.
2. Cook green beans in boiling water 4 minutes or until crisp-tender. Drain and plunge beans into ice water; drain. Combine beans, pineapple, and remaining ingredients in a large bowl. Drizzle with dressing.