Winter potato. The specialty of Guangdong is the winter noodle potato, which looks like sweet potato and winter bamboo shoots. It is rare for outsiders and is a must-have when stewed in winter. The winter noodle potato is a perennial herbaceous crop native to the tropical regions of America. Winter potato is a relatively rare ingredient, also known as winter bamboo shoot potato, sago rice, and Tokyo potato. It looks like bamboo shoots, light yellow, 5 to 7 cm long, with white flesh and rich starch, and the rhizome is almost entirely starch.