The century-old signature pastry features layers of crispy pastry and delicate, snow-like filling, creating a soft and exquisite texture that keeps people coming back for more. In the early years, Guo Yuan-yi's shop was just a small five-ping store, and the owner would roll up his sleeves every day to wash the precious mung bean filling by the small stream next to the shop. After washing the mung beans, they were roasted in a large pot to make the filling. In order to make the filling more dense and smooth, the chefs had to stand by the stove for a long time, constantly stirring the pot. They often joked that their sweat was even bigger than the mung beans. On the eve of the Mid-Autumn Festival in 1955, Chiang Kai-shek, who was living in the Shilin Residence at the time, saw a crowd of people waiting to buy the pastries in front of Guo Yuan-yi's shop on his way to the hot springs in Beitou. He wondered why there was such a bustling scene, so he asked the head of the guards to buy some. After tasting them, the President also became a fan of the century-old signature pastry.