Pan Bagnat is a popular sandwich from Nice, perfect for a picnic or a quick lunch on the go. It is made with a round loaf of bread, typically a baguette, filled with a variety of ingredients such as tuna, hard-boiled eggs, tomatoes, olives, anchovies, and lettuce. The sandwich is then drizzled with olive oil and seasoned with salt and pepper. Pan Bagnat is a delicious and satisfying option for a portable meal.