Mediterranean Salad with Green Beans and Feta

INGREDIENTS

• Coarse salt and ground pepper
• 8 ounces green beans, trimmed and halved
• 2 navel oranges
• 2 tablespoons olive oil
• 2 tablespoons white-wine vinegar
• 1 1/2 cups crumbled feta (6 ounces)
• 1 head romaine lettuce (about 1 1/2 pounds), halved and roughly chopped
• 1 small red onion, halved and thinly sliced
• 1 can (15 ounces) white beans, rinsed and drained