II
The Method
1
Combine the flour, yeast, salt, and warm water. Knead to a smooth, slightly tacky dough. Cover and rest until just beginning to puff — the Beijing version is only lightly leavened, not fully proved. The dough is ready when it yields under a fingertip but holds its shape.
2
Mix the oil and flour for the laminating layer into a smooth paste. Roll the dough out into a thin rectangle on a lightly floured surface. Spread the oil-flour paste evenly and completely to the edges. Roll the sheet tightly into a log, then coil or fold it back on itself. This is where the dish lives or dies: insufficient lamination — too few turns, too little paste, too slack a roll — produces a doughy, unlayered bread rather than the crisp, flaky interior that defines shao bing. The surface of the log should feel taut and the paste should be fully enclosed.
3
If using a filling, combine the beef mince, spring onion, salt, and soy sauce. Divide the dough log into four equal pieces. Flatten each piece, place a portion of filling at the centre, and bring the edges up firmly around it, pinching the seam tightly closed. The sealed parcel must feel firm with no thin spots — any weakness will allow steam from the filling to burst the seam during baking.
4
Flatten each filled parcel gently into an oval. Brush the top surface with beaten egg. Press the sesame-seed side firmly down into a plate of raw sesame seeds so that they cover the surface evenly and densely. Lift: no seeds should fall away when the bread is inverted. If seeds are loose, press again.
5
Bake on a hot, lightly oiled tray in a high-temperature oven — the entry specifies deep colour and crunch as the markers of correct heat. Bake until the sesame crust is deep golden, the underside is firm and coloured, and the bread sounds hollow when tapped.
6
Rest briefly off the tray. The sesame fragrance should be pronounced and the exterior should remain crisp on handling. Break or cut to check the interior: distinct visible layers are the mark of correct lamination.