Destination
Hong Kong
The story
Bolo bao is Hong Kong's most beloved bakery bun: a soft, slightly sweet enriched dough baked with a crackly sugar-cookie crust on top that fractures into a pattern resembling pineapple skin. There's no pineapple in the recipe (the name comes from the visual, not the ingredient). Sold at every bakery, cha chaan teng and street-corner shop in Hong Kong, warm from the oven from morning until early evening. The classic upgrade: a bolo yau — split hot from the oven with a thick slab of cold salted butter tucked inside, so the butter melts against the warm bread.
Method
In a stand mixer with a dough hook, combine the flour, sugar, salt and yeast. Add the warm milk, egg and vanilla. Mix on low until it comes together, then knead 8 minutes on medium. Add the softened butter in small pieces and knead 5 minutes more, until smooth and elastic.
Cover the bowl and rise in a warm spot for 60 to 90 minutes, until doubled.
Turn the dough onto a lightly floured surface. Divide into 8 equal pieces. Roll each into a smooth ball and place on lined baking trays with plenty of space between (they double in size).
Cover loosely and prove for 45 minutes.
While the buns rise, cream the butter and sugar in a bowl until pale. Beat in the egg yolk and vanilla. Add the baking powder and flour and mix into a soft dough. Cover and rest 20 minutes in the fridge.
Heat to 190°C (375°F).
Divide the cookie dough into 8 equal balls. Roll each between two sheets of baking paper into a round about 8cm across (thinner than a coin). Drape one round over each risen bun, pressing gently around the top.
Brush the cookie tops with beaten egg yolk. Optionally, score a light crosshatch pattern into the topping with a knife (this helps the crust crack decoratively).
Bake 15 to 18 minutes, until the cookie tops are deep golden and cracked.
Best eaten warm within an hour. For the classic bolo yau, split a hot bun in half and slide a slab of cold salted butter inside so it half-melts against the warm bread.
Tips
- The cookie crust must be thin. Rolled to about the thickness of a coin, no thicker. A thick top doesn't crack decoratively and dominates the finished bun.
- Chill the cookie dough briefly. 20 minutes in the fridge makes it easier to roll thin without tearing. Fully chilled cookie dough is too stiff to drape.
- Custard powder gives the authentic Hong Kong flavour. If you can find British-style custard powder (Bird's), add a teaspoon to the cookie crust for the specific eggy-vanilla note that Hong Kong bakeries use.
- Cold butter for the bolo yau. The classic upgrade needs the butter cold and thickly sliced so it only partly melts against the warm bread. Softened butter turns the bun into a wet sandwich.
- Best eaten day-of. Bolo bao stales fast (within a day). Freeze extras straight after baking (before they cool fully), then reheat in a warm oven for 5 minutes to restore.
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