Bring salted water to a boil in a large saucepan; add beans. Return water to a boil; boil just until beans are crisp-tender (about 5 min.). Drain; move beans to a large mixing bowl. Drizzle with oil and vinegar; toss to coat. Season to taste with citrus salt and pepper; toss again; Move beans to a serving platter; sprinkle evenly with cheese, onion pieces, pine nuts and lemon zest. Serve immediately.
Note: This dish is also excellent as a cold salad. After blanching beans in the boiling water, drain and plunge them into ice water. Once cool, drain again and refrigerate for up to 2 days until needed. Finish beans as noted above.