1. Brew the butterfly pea flowers in boiling water, put it at about 40 degrees, add yeast sugar and stir evenly, pour in the flour, knead it into a smooth and hard dough and relax for 10 minutes.
2. Add sugar and yeast to warm water, mix well without particles, add flour and knead into a smooth dough.
3. Add cocoa powder to the white dough and knead it into a smooth dough for later use.
4. Roll the cocoa dough and blue dough into a beef tongue shape, stack them, and roll them into a 10.5 cm thick beef tongue shape.
5. Cut into two-finger-wide strips, stack the thumbs section by section. Press a toothpick in the middle to stack up, and then press a toothpick from the wide area.
6. Pinch the middle part of the surface. Also pinch both sides.
7. Put a black bean to look better.
8. All plastic surgery, proofing to 1.5 times the size.
9. About 1 hour later, put it on the pot, steam it on high heat until it vents and count for 10 minutes, turn off the heat and simmer for 3 minutes.
