Tuna niçoise salad with potatoes, green beans and egg

Steps

1. Boil the halved potatoes in salted water for 15 minutes; add the green beans for the last 5 minutes and drain.
2. Boil the eggs for 9 minutes, cool and quarter them.
3. Whisk a dressing from mustard, vinegar, salt and pepper.
4. Arrange the salad leaves, potatoes, beans, eggs, drained tuna and olives on a plate and pour over the dressing.