2. Making dough: First, pour 250g of flour into a basin, mix it with135g of water (water temperature: hot in winter, cool in summer, warm in spring and autumn) and ferment it in a warm place, then mix 250g of flour with140g of water to make dough. Then put the two sides together, add alkali and smooth them, close the strips on the chopping board, pull up 30 pills, round them and flatten them to make the dough.