Egg tarts come in many variations within Hong Kong cuisine, including egg white, milk, honey-egg, ginger-flavoured egg, which are variations of a traditional milk custard and egg custard, and also chocolate tarts, green-tea-flavoured tarts, and even bird's nest tarts. Overall, egg tarts have two main types of crusts: shortcrust pastry or puff pastry, traditionally made with lard rather than butter or shortening.