Step 1

Make dressing: Whisk oil, vinegar and mustard in a jug. Season with salt and pepper.

Step 2

Cook potatoes in a large saucepan of boiling water for 10 minutes or until just tender. Transfer to a large bowl. Add beans to pan. Cook for 2 to 3 minutes or until bright green and just tender. Drain. Refresh under cold water. Drain. Add beans to potato.

Step 3

Add tuna, tomato, olives, lettuce, egg and anchovies (if using) to potato mixture. Add red wine dressing. Toss gently to combine. Season with salt and pepper. Serve.