The main ingredient in a flan is eggs. Flan is a traditional custard dessert that is characterized by its creamy texture and rich flavor. In addition to eggs, commonly combined with milk and sugar, flan often includes vanilla for added flavor. The mixture is poured into a caramel-coated mold and baked in a water bath, creating a smooth, silky custard that sets as it cools. The dessert is often inverted for serving, showcasing the caramel sauce on top. Flan is popular in various cultures, with variations in flavor, texture, and presentation, making it a beloved treat worldwide.