A Kunming breakfast bun whose steamed dough pulls apart into many thin, flaky layers — 破酥 means 'broken into flakes.' A leavened wheat dough is rolled thin, smeared with lard, dusted with flour, and rolled up so that layers of dough and fat alternate; portioned, filled, and steamed over high heat, the layers separate as the fat melts and the dough sets. The filling is sweet — rose-and-red-bean paste, or sugared Yunnan ham — or savory, with diced pork, winter mushroom, and bamboo shoot. The sugared-ham version, at once sweet and salty, is the best known.
Flaky steamed buns are an old Kunming breakfast item, said to have begun in the city's Cuihu (翠湖) lake district, and the city has eaten them for well over a century. A popular tale credits a baker whose dropped bun shattered into pieces, inspiring the layered 'broken-flake' style and its name, but this is folk etymology rather than documented record, and the exact originator and date are unrecorded; the name is most simply read from what the bun does — its steamed crust breaks into flakes. The dish belongs to the lard-laminated tradition of southwestern Chinese pastry, and the sugared-ham filling reflects Yunnan's signature cured ham (云腿).
Lift the lid and a good one stands tall and slightly cracked at the crown; tear it and the wall comes apart in fine, soft, papery sheets rather than as one bready mass. The crust is tender and almost dissolves, faintly rich from the lard. A sugared-ham filling runs sweet first, then the salt and savor of the cured ham close behind, sweet but never cloying; a savory pork filling is juicy and lightly seasoned. Done well, the layers are distinct and the bun is light; done badly, the lard has leaked and the dough is dense and greasy, or the layering was skimped and it eats like an ordinary plain bun.
The flakiness comes from laminating fat between sheets of dough. Lard is solid and plastic at room temperature, so when it is smeared over rolled-out leavened dough and the dough is rolled up, it forms continuous films of fat separating layers of dough — much like the logic of puff pastry, but on a soft yeasted base. In the steamer the lard melts and greases each interface so the layers cannot fuse, while the heat sets the dough's gluten and the yeast's gas expands the sheets apart; the result is many thin, distinct leaves. A 'meat' lamination (荤酥) uses lard, a 'plain' one (素酥) uses vegetable oil, which is softer at room temperature and gives a slightly different layering. High, steady steam is essential — open the lid early or steam too gently and the layers collapse and weep fat before they set.
Variations
The two great divisions are sweet and savory. Sweet versions take rose-and-red-bean paste (玫瑰豆沙) or sugared Yunnan ham with sugar and honey; savory versions take diced fresh pork with winter mushroom, winter bamboo shoot, and 玉兰片 (sliced dried bamboo). The sugared-ham (糖腿) and winter-mushroom (香菇) fillings are the two most loved in Kunming, and newer shops have added barbecued-pork and other fillings. Lamination technique splits into 大包酥 (laminating each portion individually) and 小包酥-style batch methods. A separate, unrelated 安顺破酥包 is a known specialty of Anshun in neighboring Guizhou.
On the Palate
Where Kunming Flaky Steamed Bun sits in the Chinese flavor cloud
Ingredients
Serves 8
How it's made
7 steps · 1 hour active + 2 hours waiting
- 190 min
Leaven a soft white-flour dough with old starter until risen, then work in food-grade alkaline water (碱水) to neutralize the sourness and knead smooth.
- 25 min
Separately rub lard into a little flour to make a soft fat paste for laminating.
- 38 min
Roll the leavened dough out thin, spread the lard paste evenly over the sheet, and dust lightly with dry flour.
Watch outSpread the lard paste in a continuous even film — those unbroken fat sheets are what melt apart into distinct leaves; a patchy smear fuses into solid dough.
- 48 min
Roll the sheet up into a long log so the dough and fat form many alternating layers, then cut it into even portions.
- 515 min
Flatten each portion cut-side up, wrap it around a sweet (rose-bean paste or sugared ham) or savory (pork, winter mushroom, bamboo shoot) filling, and gather the top closed.
- 618 min
Rest the filled buns briefly to proof, then steam over high, strong heat in one continuous burst until set and risen, about 12-15 minutes.
Watch outSteam over strong, high steam in one continuous burst — a weak or interrupted steam collapses the layers before they set.
- 73 min
Turn off the heat, wait a moment before lifting the lid to keep the layers from collapsing, and serve hot.
Watch outWait a moment after the heat's off before lifting the lid — a sudden cold draft shocks the risen layers flat.
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