The primary ingredient in custard is eggs. Eggs are mixed with milk or cream and sugar to create the rich, creamy base of the custard. When cooked gently, either on the stovetop or in the oven, the proteins in the eggs coagulate, thickening the mixture and creating a smooth consistency. This versatile dessert can be flavored with vanilla, chocolate, or fruit purees and can be served warm, cold, or baked. Custard is often used as a filling for pastries, tarts, and other desserts, or enjoyed on its own. It has been a beloved treat in many cultures for centuries.