Why is Yucai called a tiger?

Because of Zhang. According to relevant information, Zhang was in a bad mood, so the chef cooked a new dish with his favorite vegetables. Zhang was nicknamed the Northeast Tiger, so he was called the Tiger. Zhang, the father of patriotic general Zhang Xueliang, was the grand marshal of the leader of Feng Department in the Republic of China. He took part in the Sino-Japanese War of 1894-1895. After he was recruited by the Qing government, he served as the governor of Fengtian and the governor of the three northeastern provinces, and was known as the "King of Northeast China".