1. Wash the pumpkin, peel and remove the pulp. 2. Cut into small pieces. 3. Put it in the pot and steam for about 20 minutes, until it is completely cooked. 4. Filter out the steamed water. 5. Mash the pumpkin puree. 6. Add flour and yeast. 7. Knead the dough until it is smooth. 8. Put the kneaded dough in a basin, wrap it with plastic wrap, and ferment at room temperature to twice its original size.