Nicoise salad is a French salad that originated in the city of Nice. It is made with boiled potatoes, green beans, tomatoes, hard-boiled eggs, olives, and tuna, dressed with a vinaigrette made with olive oil, Dijon mustard, and vinegar. Nicoise salad is a hearty and satisfying salad that is often served as a main course. It is a great option for those who prefer a salad with a combination of vegetables, protein, and a tangy dressing.