1 Ingredients: low flour, high flour, whole wheat flour, butter, yeast, powdered sugar, salt, baking soda and water.

2. Knead the softened butter, flour, powdered sugar, salt and baking soda into dough;

3. After kneading, wrap it with plastic wrap and wait for about 20 minutes;

4. Fold the dough from 1/3 to the middle, and then fold the other end from 1/3 to the middle to complete the first three folds;

5. After folding, put the seam down, roll it out into a rectangle, then fold it three times, roll it out again, fold it again and again, and fold it three times.

6. Roll the three-fold dough into a thin sheet with a thickness of about 0.2 cm, and fork out even holes on it with a fork;

7. Cut into square pieces, put them on a baking tray, spray water on the surface, ferment for about 20 minutes, and then put them in the oven.

8. Preheat the oven to 170 degrees and bake for 15 minutes.