Formula problem, multi-source fermentation, cold is not hard, soft is easy to bite. Formula: 10 kg flour, 100 g foam source, 5 g fresh milk essence, 50 g salt, 1.2 kg sugar and 5 kg water. Technology: put the above raw materials into dough, ferment for 30-50 minutes (normal temperature fermentation 1-2 hours), then set, brush syrup, sprinkle sesame seeds, and send them to a converter for baking.