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. The salad is dressed with a vinaigrette made with olive oil, vinegar, and Dijon mustard. Nicoise salad is a hearty and satisfying salad, with the tender potatoes, crisp green beans, juicy tomatoes, creamy eggs, briny olives, and flavorful tuna. It is often served as a main course and is a popular choice for lunch or dinner.