1. Knead water and all-purpose flour to form a dough
2. Wrap in plastic wrap and seal for 2-3 hours
3. Soak the white beans overnight
4. Puree with a food processor
5. Put butter in the pot and melt it over low heat
6. Add white bean paste, white sugar and pork floss and stir fry
7. Stir-fry until it is kneaded and not sticky
8. Spray the surface of the duck egg yolk with white wine at 150 degrees and bake for 10 minutes
9. Wrap the prepared ingredients into balls and fix them with a mold
10. Bake for 5 minutes to set the shape and brush the egg milk on the surface
11. Bake in the oven at 130 degrees for 40 minutes
