Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Mandarin rolls, steamed Mandarin rolls, flower buns, or huā juǎn (Chinese: 花捲/卷) are a kind of steamed bun that originate from northern China but are popular throughout the country. Like mantou, the mandarin roll is a dim sum dish and a staple of Chinese cuisine. Huā juǎn are named for their distinctive shape; the literal English translation of "huā juǎn" is "flower twist."
The dough of the rolls is made of wheat flour, yeast, water, salt, sugar, and baking soda; sometimes soybean oil, vegetable shortening, and milk or milk powder are used. After proofing, the stretchy and pliable dough is layered with scallions, sliced and twisted into layered knots, and steamed. The result is a lightly oily roll with a pillowy, fluffy texture and pleasant chew.
Mandarin rolls are usually savory, thanks to the use of scallions, salt, and occasional addition of Chinese five spice in the filling. However, sweet versions also exist. Because southern varieties of mandarin rolls are slightly sweet, they can be eaten plain. Sometimes they are eaten with sweetened condensed milk.