• Cook potatoes in large pot of boiling salted water for 10 to 15 minutes or until tender; drain and rinse under cold water. Set aside. Cook beans in boiling water for 3 minutes or until just tender; drain and rinse under cold water. Set aside.
• Place eggs in small saucepan; pour in enough cold water to cover and slowly bring to boil. Simmer for 6 minutes; drain and rinse under cold water. Peel and cut into quarters. Place potatoes, beans, eggs, tomatoes, cucumber, tuna, capers and olives in large salad bowl.

Dressing: In small bowl, combine olive oil, red wine vinegar, mustard and sugar; whisk together with a fork. To serve, drizzle dressing over salad; toss to mix well.