What is the traditional filling of "zongzi," and how is this dish prepared?

Zongzi are traditional Chinese rice dumplings wrapped in bamboo leaves, typically eaten during the Dragon Boat Festival. The traditional filling consists of glutinous rice combined with various ingredients such as marinated pork, salted egg yolks, chestnuts, and dried shrimp. The rice and filling are wrapped in bamboo leaves and steamed or boiled until fully cooked. The leaves impart a subtle aroma to the rice, making zongzi a flavorful and aromatic dish.