1. Add 50 grams of butter to 40 grams of powdered sugar to soften it slightly
2. Beat with a manual whisk until the color becomes lighter and slightly enlarged
3. Then add sifted low-gluten flour and cocoa powder, mix into a dough
4. Put it on the chopping board and arrange it into a cylindrical shape
5. Put it in the refrigerator and freeze it hard and cut it into a few millimeters of wafers.
6. Then put it in the oven and heat up and down at 160 degrees, about 20 minutes, and the surface will harden.
7. Then it is to configure the filling, 25 grams of butter is heated in water to form a liquid
8. Pour in 60 grams of powdered sugar and stir well and let cool.
9. The last step is the assembly process, a piece of biscuit is put on top and a little filling is spread out
10. Cover with another biscuit and leave it for a while
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