Okay. Egg yolk puff pastry is a Chinese snack that is full of color, flavor and taste. It has a distinct texture and a crispy outer shell. Wanqi egg yolk cake is very delicious. The main raw materials are wheat, butter, and egg yolk. The ingredients include white sugar, water, soybeans, bean paste, salted duck eggs, etc. The recipe has many similarities with Su-style mooncakes. Traditional egg yolk puffs use lard, and the use of butter eliminates the trouble of boiling lard and enhances the taste.