How to put alkali in steamed bread?

Ingredients: 500g flour, appropriate amount of flour fertilizer and appropriate amount of clear water? Accessories: soda ash 10g

Step 1: Boil the flour fertilizer with water.

Step 2: Put the flour into the dough, cover it and wait for fermentation.

Step 3: Ferment the dough.

Step 4: Prepare 10g edible soda ash.

Step 5: add water to form alkaline water.

Step 6: put it into the fermented dough.

Step 7: Knead evenly.

Step 8: Put it on the panel.

Step 9: pull it into flour paste.

Step 10: Knead into steamed bread blanks.

Step 11: put in a steamer and steam for 25 minutes, then turn off the fire and steam for 3 minutes.

Step 12: Steam steamed bread.