What is the oil fragrance of Hui nationality? Why do Hui people especially like oil incense?

Oil fragrance is one of the traditional foods of Hui nationality. The common production method is: "firstly, add yeast into flour, mix it with warm water, neutralize it with alkaline water after fermentation, then add a proper amount of dry flour, clear oil and eggs, knead them repeatedly and evenly, cut them into several round cakes, press two or three knives on the surface, fry them in an oil pan, and take them out when the color is red and soft and the taste is delicious and mellow." Hui people who are distributed all over the country have different raw materials for making oil incense from place to place, and the types are also different from those in the north and south. For example, "Northwest Hui people have mild oil fragrance, sweet oil fragrance, oil fragrance of scalded noodles, oil swirl of hair noodles, etc." Southern Hui people in Quanzhou and Yangzhou have glutinous rice and sweet potatoes. "However, there are similarities and differences. Historical records of Hui people in various places have repeatedly told us that both the Hui people in the north and the Hui people in the south have the custom of eating oil incense. Generally speaking, "people with the same culture enjoy the same eating behavior." "Oil-scented customs are loved by Hui people everywhere, so what kind of cultural implications does it contain? What are the benefits of revealing these meanings for us to know and understand Hui culture? With these problems, it is of special significance for us to make a concrete investigation on the oil-scented customs of the Hui nationality.