Bo Lo Yau
冰火菠蘿油·(bing-fo bo-lo yau)
Cha Chaan Teng Mornings: The Weekend Breakfast Ritual
The pineapple bun contains absolutely zero pineapple, earning its name entirely from a golden, shattered crust that mimics the skin of the tropical fruit. In the bustling cha chaan tengs of Hong Kong, this pastry achieves its final, glorious form as Bo Lo Yau: sliced open while steaming hot and stuffed with a shameless slab of ice-cold salted butter. It is a masterpiece of contrasts—sweet and savory, melting and solid, fire and ice. By substituting the harsh baking ammonia of commercial bakeries with standard leaveners and leaning heavily on the tangzhong method, grandma's intuition is translated into an accessible recipe that ensures the buns remain bakery-soft for days, ready to be revived for a chaotic Tuesday morning.
Before you start
The dough can undergo a slow, cold ferment in the refrigerator overnight.
After mixing, place the covered bowl in the fridge instead of proofing at room temperature. This builds excellent flavor and breaks the work up across two days.
Tangzhong extends the shelf life of the bread, making these perfect for weeknight mornings.
Buns baked on Sunday will remain pillowy soft through Wednesday. Reheat a day-old bun in the microwave for exactly 15 seconds to revitalize the crumb before stuffing it with the cold butter slab.
Ingredients
- bread flour3 tbsp
- water1/2 cup
- bread flour2 1/2 cup
- granulated sugar3 tbsp
- dry milk powder1 tbsp
- kosher salt1 tsp
- instant yeast2 tsp
- egg1 large
- whole milk1/3 cup
- unsalted butter3 tbsp
- cake flour1 cup
- granulated sugar1/2 cup
- dry milk powder1 tbsp
- baking powder1/2 tsp
- baking soda1/4 tsp
- unsalted butter4 tbsp
- egg yolk1 large
- evaporated milk1 tbsp
- vanilla extract1/4 tsp
- egg yolk1 large
- whole milk1 tsp
- salted butter1/2 lb
Method
- 01
Whisk three tablespoons of bread flour and a half cup of water in a small saucepan over medium-low heat until it suddenly thickens into a shiny paste.
This tangzhong will take about two to three minutes to form. Remove it from the heat immediately, scrape it into a small bowl, and let it cool completely to room temperature.
- 02
Combine the dry dough ingredients in a stand mixer, whisk the wet ingredients with the cooled tangzhong, and mix them together on low speed.
Once a shaggy dough forms, add the three tablespoons of softened dough butter one tablespoon at a time, then knead on medium speed for 10 to 15 minutes until the dough forms a smooth, elastic ball that passes the windowpane test.
- 03
Transfer the dough ball to a lightly oiled bowl, cover it, and let it rise in a warm spot for about an hour and a half until doubled in size.
- 04
Cut the softened crust butter into the cake flour, sugar, milk powder, baking powder, and baking soda until the mixture resembles wet sand, then stir in the egg yolk, evaporated milk, and vanilla.
Mix just until it forms a cohesive cookie dough without overworking it. Roll it into a log, wrap it tightly in plastic wrap, and refrigerate for at least 30 minutes.
- 05
Punch down the risen dough, divide it into eight equal pieces, and form each into a tight, seamless ball.
Place the buns on a parchment-lined baking sheet at least 3 inches apart, cover lightly, and let them proof for 45 to 60 minutes until puffy and visibly larger.
- 06
Slice the chilled crust log into eight discs, gently roll each into a 3.5-inch circle between two sheets of plastic wrap, and drape them over the proofed buns.
The crust should lay over the top and upper sides of the bun like a small blanket. If the kitchen is warm and the butter in the crust starts melting, chill the whole baking sheet in the refrigerator for ten minutes.
- 07
Brush the crusts with a wash made from the beaten egg yolk and a teaspoon of milk, then gently score a criss-cross diamond pattern into the tops with a butter knife.
Place the baking sheet in a preheated 400°F oven, immediately drop the temperature down to 350°F, and bake for 15 to 18 minutes until the crusts are deeply golden and cracked.
- 08
Slice the steaming hot bun horizontally and insert a thick slab of freezing cold salted butter directly into the center.
Eat it immediately so the butter begins melting into the hot, sweet crumb while remaining a solid, icy block of savory fat in the middle.
Notes
Do not skip the dry milk powder.
It is the unsung hero of Asian bakeries, adding a deeply nostalgic, concentrated dairy sweetness without disrupting the dough's liquid-to-flour ratio.
Keep the crust dough perfectly cold.
If the butter in the crust melts before hitting the oven, the topping will liquefy and completely slide off the bun during baking. Work quickly and refrigerate the draped buns if they feel soft or greasy to the touch.
The natural cracking is more subdued than commercial bakeries.
Traditional Chinese bakeries use baking ammonia to cause a violent expansion and shattering of the crust. By substituting baking powder and scoring the crust manually, you bypass the harsh chemical odors at home while achieving the identical look and flavor.